Bore 60 over. Machinists don't like going over .

Bore 60 over Had it done for my 65 and sold the car with the old engine in it. A . we have got together with one of the best piston company in usa to design you guys a new style piston . 400 . Otherwise, normal use and the occasional blast should be no problem. As a result, the engine’s power and torque output can be significantly improved. 060 over in order to use the block. would a 400 bored to 40 over be?Can you bore Ok ive been looking online and i see all sorts of answers. No, I am meaning will they bore it out how much you want on each cylinder (like I want to bore . 060 over and lived through long abusive lives. 060-over to 4. 060 over could be done, but you need to have the block sonic checked first, as most W's (302 especially) suffer ill effects over . 060 inches to boost the engine’s performance. I wont be using these (bored the 4G64 block out some), so I was wondering if they would fit in my 1G TSi. Would I "buy" a . Yes, the guy actually has 2 different size bore cylinders in it, with pistons to match. Profile Page. its bored . If companies make . I might get by with honing it and new set rings. 20 The Pope 77 F250 2wd, C6, Long Bed, HD Susp. ive won many frickin races with this motor. Hey guys I had a 351w in my cougar but a bearing spun and broke number 7 piston into pieces. so i know a 40 bore is safe, i will see if it cleans it up. This was because the original bore job that was done on it was so horrible that it took going 60 over by another machine shop just to clean everything up. 60 over) they will charge me $8 for that cylinder? I thought u were meaning $8 to bore it like . It runs great. As a result, the 350 Bored 60 Over means that the engine has a bore of 3. ANY production block in my opinion is only safe to . You can bore it out to the 312, maybe more. I can feel some scratches in the cylinder wall. My machinest said it's no problem to go,60 over on my 402 but I've herd others say my cylinders would be too thin. Chances are it's fine assuming the bores clean up at . 1 bore right? - Hi All, Setting up the rings on my fresh 390 today. 125 was std bore, they make . Should be OK, 60 over is the max I'd go with any 350. 080 over, for starters, the 600 is a much larger piston, so . but its what i wanted. 60 over - so my old 454 is apart and the rebuild begins. " I talked to 3 shops in my area that said they will go up to . Its a 302. Some would hang and some would bore through. 02" intake and 1. 030″ over the standard 400 SBC bore size of 4. 060" is pushing your luck. 137 posts · Joined 2003 Add to quote; Only show this user #1 · Apr 5, 2004. 005", which you would need to anyway if you went . if not, then i will have it sonic tested and go 60 if it will handle it and then proceed to start ordering parts from there. ericnova72. 155. 060 inches (although for serious power-adder use I'd back that down to 4. The late 60`s 327 large journal which was only made 2 production years of 1968 and 1969 are also okay to go . The guy who rebuilt my motor had bored it . 030" over bore would not clean this cylinder up, so they had to put a sleeve in it. My 390 is bored 60 over. But if the factory service pistons were limited to . I personally have gone . If the core is crooked 40 over max so a 60 over 4. Jump to Latest 30K views 3 replies 3 participants last post by BillyBanana Jul 27, 2003. Save Share Reply Quote Like. I've built 2 that were . 7 rods I built a 545, DIVE . i have read conflicting info online, some people say you can take a bbc to . 875. 75 crank. 25" stroke. Page 1 of 2 1 Been doing some searching and found someone selling a 1974 Pontiac 400, . Is the engine being bored 60 a concern or pretty normal in these engines? The main reason us racers want larger bores, is for valve relief, and cubic inches. Mainly because the 400SBC is a Siamese bore unlike the 350 SBC which is a standard bore. 59 cubic inches time 8= 460. The pistons are machined from "BBC blanks". Then change that bore to 4. We ran a few at 60 over but none ran like they should have. That would mean I'd need to bore the block . i will bore the min i can, it's 30mi from me. So the formula would be pi are squared times stroke times number of cylinders. It was $285 exchange. 030, . 100" over with another. it's my understanding that the later '76-'78 blocks were not made of as good a quality iron as the'75 and under and this is why the engine manuals wanted over bores limited to . If you can bore engines over 120 then why the hell does everyone sleeve them around 60? I would never bore an engine over 60. it may have 460 cubic inches is the DISPLACEMENT (size) of the engine. Reply With Quote # The difference in the bore is . _____. Times the stroke (3. xxx 60 over 3. 030 over - 4. 60. You should be able to bore your 57 block more than . All the way to 469 CI(4. My 70 340 block was bored 60 over when I got it. bore 60 over; it's just that 0. 13 which is the stock 428 bore. 1/2 bore is also called the radius. 030 (0. thick before boring and . 60 because then you run into piston availability and with the newer blocks and their thinner walls, . 000, 4. Boring a YZ80 . Cheers, Problem is, one cylinder is . There are a few 390 blocks that can be safely bored to 4. Gotta multiply the bore by the ring gap factor to determine gap. i'd bore is little as possible; . Some may I have some 4G64 with 4G63 Wiseco Pistons from my Turbo 3G project. I am glad that there is someone else that only remembers pi to 3. 060" over, and I was driving it everyday to work. 60 is that ok or will it over heat? thanks, Save Share Like. Im building a 414 stroker. Appears to be a free-be so take it and get it sonic checked to see if . 0-inch bores; they can be punched 0. 39 cubic inches. 60 over? I want to add twin turbo to the engine or should I get another one? thanks guys lmk. 60over and if its stroked to a 496 what will the final cc be? thx 60 over? Jump to Latest Buddy said no big deal he will pin and patch it but i went and picked up anuther block that was bores 40 over 10 years ago and never totaly resembled and would need bored again. They did say that you CAN The only block exception is the motorsport block with siamesed cylinder bores. . and a lower HP curve with increased HP through the bottom end. Also any machine shop you take a block like this too and ask about going 60 over they will sonic test the block first to What do you guys think about a sbc 400 60 over runing on the street. 030 etc just means the pistons are 4. A rebuilt head was $65 with new guides. There does not seem to be much chatter about a 4. 7 H beam rods, Diamond pistons . 736 so "NO" at . 21 Will a 1976 455 Pontiac engine from a Grand Prix bolt right in a 70 GTO and can you I have a 1971 402 big block that's already bored 30 over for a bore of 4. 060 over unless you plan to race it consistently. shockers69 Discussion starter. im going to restore the car completely. The “60 over” refers to the fact that the cylinders have been bored out . C3 Tech/Performance - 400 Bored . 60 over block then by all means don't. Joined Nov 3, 2010 Messages Most of them can go a LOT over. 60 over block and it's pushing out close to 550 hp, and I rev it to almost 7000 rpm. 06 overbore, and asking for advise. Profile Most will take 60-over, but any more I would sonic check the bores for core shift. 30 over and . My thoughts say 40 over max for an engine that will ever see 6 grand. 8/351W) - 302 bored 30 over? 60 over? - i just tore down my 302. 12 at 122 mph and 1. This is achieved by boring the cylinders out . bopedersen said: As many have stated previously there's nothing wrong with a . 060 inches would be 4. What's new. 1” stroke. S. 375"stroke) on a STD 428 BORE!!! 600HP is easy with bolt on parts and nothing really ported or crazy/fancy. Is it feasible($) to keep the block at 40 over or go to 60 over. ok hears the deal i think i got a 327 or 283 i ran then motor#,s at mortecs it says it can be either one but heres the ??? when i took the motor apart it had 60 over pistons in it what would the bore be on a 327 60 over same for a 283 60 over. It's 60 over now with new pistons, block sonic checked, crank cut to 20 under, cam bearings r&r, hot tanked, rods resized with high strength bolts, all bearings and rings included from the machine shop. 14159 X stoke x #of cyl. I got a 30 over 302. 56 square inches. 60 over already. Next Last. 4 40-over is 356. Safe to bore a 383 60 over? Thread starter 4fortyDemon; Start date Sep 12, 2023 - 1; 2; 3; Next. Cheap aluminum radiator in the 65 would get over 200 in 100* weather in traffic. what would this make my 302 in cubic inches? how about 60 over? does this make any noticable difference in power/mpg? thanks. 5796 * 3. 60 over bore on a 350 SBC. 185 for a street cruiser. if i had to go to 60 thou over i would probably trash the block and use the 350 4 bolt virgin block i have, and make a 383 stroker motor. That is . However, there are disadvantages to boring your 350 60 over which you must take into account. The guy doing my motor said he thinks ww would have to sleeve cylinders and heard of over heating problemes. 60 over right now, and needs an overbore He would buy new ls6-7 blocks and bore 125 over. Link To eBay Motors. You increased the value of your engine with a nice set of forged pistons as well. Not trying to say yes it is or isn't safe, I've never heard of anything flexing. 04 Just needed to know how far you can bore a sb chevy 350 without having cooling issues. 60 over . I believe both are . tom at no time have i said i want to bore to 60 thou over. and bore size doesnt affect cooling that is a myth from the bogan era I had my motor for maybe a half a year. You also saved the $60-100 on the sonic test, which should be mandatory on the . I might need to bore mine . what does 30 over really mean? - There is a limit to how much you can over bore a block before the cylinder walls become to thin. 250 (std)+. 300 stroke - 521 inches - 6. B. 440 bore . (good enogh for govenment work) I had an engine built for my 68 Chevelle. 60 listen to the foxchassis he know what he is talking about an . 9 30-over is 355. 030 - . Harley FXR. I. off stock numbers. Another reson is lets say you have a really nice and thick walled block you could bore . 00 = 57. I would also note that if you're looking for a bigger bore you can probably get a 350 core for much less than it will cost you to bore the 305, and you'll end up with more more than the 0. C3 Tech/Performance - Engine rebuilds. 60 valves and . 060" is just fine for any of the 360 engines. basically its bigger on the top than the bottom thats why you can feel a ridge where the piston rings stop at the top. IIt could be that some blocks are flawed or rotted on the inside and won't take a . 015 gasket and a 252@. But, either way, the 402 is not just a 396 which Chevy If the bores are perfectly round and not ovate (i. 060 over piston help - Hey guys, Just dropped off a 390 block to get cleaned up and bored . Would I bore it to 60 if I didnt have to, No but run what you've got, at least youll be driving the bronco and not saving for another motor wishing your driving It is always better to actually check the bore rather than assume that it is the "book" value + the overbore. @ 4. He had money and wanted the largest cubic inches possible. vintagemotorsports. A 350 bored 60 over refers to the process of increasing the engine piston size to 60 thousandths of an inch, making it 0. Engines are the beating hearts of any automobile, and enthusiasts always look for ways to Looks like I may be picking up a 427 this weekend, but I want to check it out first. The correct method BEFORE overbore is to find the true engine centers, and over bore to those centers, / 302 engine short block (they did not differentiate, but if they had a 290, would give it to you) came as either 30 or 60 over, with 20 20 cranks. I thought you couldn't bore 400's that big because of the cooling passages? Also, any thoughts on building a 400 for Vette use? I'm loking to build a torquey small block to give myy 77 more oomph coming off the The motor in my bronc is 60 over, yeah it ran a little hot when I first put it in but with a new radiator it has given me 25000 trouble free miles and Ive driven the sh#t out it. 030" is that the bores may not be able to hold their shape (I've seen one where you could light between the rings, and cylinder wall). but do have the block sonic checked and not just one bore all the bores on the thrust side . 030″. I have taken a thick cylinder block to 4. 30/. 060" over pistons, you better believe the engines will go that far safely. If you plan to go bigger, personally I prefer to find a virgin bore to start with, These longer stroke engines benefit from higher torque. some people have been successful at . 060 over block - not likely. Home Forums > Maverick/Comet Forums > Technical > 302 . A 350 engine bored 60 over involves increasing the cylinder’s diameter by 0. My 351 has to be bored 60 over i have no choice. Which sized pistons and rings will I need to buy to fit this new bore size? Do any of you know a good website where I I recently dissambled my sbc 350 that I had planned to build a 383 stroker out of. 060 over 402 pistons in a . No reason to do that when there are plenty of inexpensive cylinder blocks that either don't even need an Are your block's front and rear cam journal bores centered in their casting pads, or off-center? Same question for the lifter bores and their pads. Standard bore for a 460 is 4. 060" Over ( Total Bore Increse) va4cqd said: 401 cubic inches stock 390 is 4. Range of Gemini chokes for Beretta Optima Plus - Bore 18,60 shotguns 12-gauge for hunting and clay shooting. Save Share 60-over is 360. Its a 454 mark iv motor gen V. Flat top pistons and a mild cam. 1416 * 4. Most become heaters. These issues stem from the increased internal pressures and temperatures created by the increased bore size, which can strain the block, pistons, rings, bearings, and oil system. 030 but it was a full fill block. It's held together for two years now and i'm not a light footed driver. When a block has been bored . 00 inches to 4. This one has a Boss pan, windage tray, oil pump from a Boss, 60 over flattops, 351 cam, 302 heads with oversize valves, torquer highrise. Cliffy. Ive been thinking about building a real mild 327 and wondering if I can't hone the cylinders back to usable shape if going 60 over was a possibility. It also has a street dominator and a 750 cfm carb on it. i say its bull shit that you cant bore it . 41” bore and 4. There's a bunch of sites out there for them Machinists don't like going over . 060 !. 420 . 060 over bore, how do calculate extra cubes? What size will it be, 470? Thanks for the info! If you don't feel comfortable building the . it went mid 11's The Oldsmobile 455 had a bore and stroke of: 4. 6" exhaust. If you don't have any thin sections, you might be able to bore it out . I calculate the result of a 60 over 327 to be 336ci - The bore over the 327 and 350 were both 4" Generally, you'll find that quick rev of the 327 to be due to it's short 3. I'm with RickL on that BS about +60 bores making an engine run hot ; if anything , the thinner walls allows for better heat transfer and will run cooler . As an example, when I had my engine rebuilt, the shop found that the #1 piston's wrist pin came loose and scored the block. Sort by Oldest first yea its 302 lol. 10 on top of the . 230 min. 99. That is, the same amount of heat will be produced regardless of the bore size I think the cooling issues thing is a myth . 60 over os OVERkill, most To test what I am saying, look at the compression ratio of a 4" bore engine. I've got a 1960 4 bolt 389 block and a 1962 replacement 389 SD 4 bolt block. 30 Duntov Cam ,,Rochester Fuel That will work fine. 060 over and the guys machine shop says it just needs to be honed to be ready to go. 40 over should I still use this block and bore it 0. If bores are centered, the block Boring . 060 over when I went to give it a freshen up. Having said that, I think . 030" over, the other problem going over . I have bored many . 100" over and some have difficulty going . 100 on the wrist pin side before boring and we find many blocks that would not be safe at . 22868 posts · Joined Ok. 73 Gears,Steeda LCA's,FRPP UCA's,Mickey Thompson ET Drag Radials. So think I am going to be happy. Can You bore a ford 292 y block . 060 over 289, face plated T5. Save Share Like. Recommended max bore of 60 over on any big block depending on core shift. 60 and not have any thinner bore walls than you would on a 350 bored . 60 over safely. 040 - . 020 over. 00 inches for a total displacement of 350 cubic inches. They were built as a 402. I'll update this weekend. Is this safe? Would there be enough cylinder wall material Believe it or not , most 2-bolt main blocks are pretty good , line-bore wise and for core-shift . 39 and 4. 500 stroke 545 inches - 6. 00″. e. 080 over and runs cooler than most stock blocks at . ive ran this motor for over 20 years without any trouble. and the pistons are stamped 30. 155 over. 030 you increase the bore to 4. 13 (std 428) and got 478 peak horsepower. My 388ci is . 060. The heads are 353049--opened chambered. 780 stroke ok my engine is gettin bored over 60 not by choice though, lol im trying to decide if i should get domed or flat topped pistons. 0L truck blocks that have 4. The 4. 126 X 4. Member. Home. 030 over rings i file fit to those standard bore pistons. 020 between a . A typical engine displacement calculator will not tell you if an engine is over or under square, but determining the bore to stroke ratio will. 383's have thicker cylinder walls than 440's so you should be safe at 60 over (more 60 over pistons available) Up date on the 383 motor Machine shop say bore will be 40 over stock and crank only need's 10 thou. The block is a 1974 Casting. these are a set high quality forgings with new Bored . 030 over 396s. 090". 094 std bore a couple years later 4. (yes 3000). 140 (, square that and multiply it by Ð (3. 440. These issues stem from the increased internal pressures and temperatures created by the Is 60 over too much? If you can bore engines over 120 then why the hell does everyone sleeve them around 60? I would never bore an engine over 60. C3 Tech/Performance - 454 with . 080 over will net a lot fewer ccs over the current set up than boring a XT600 . 060" over on a mild/moderate street engine. No idea why, though. My 390 is bored 60 over, so that makes a 4 inch bore 354 is a couple of thousands over 60 and should be fine. 94-1. 3. 08 over a stock 4. 371 had a different stroke and a 4" bore if these are "60" over 371 pistons get a 371 block dbl check the compression height to what is required for your 324 3/16 is for flatheads . They called back and said the motor had already been . It is EXTREMELY UNLIKELY that you could ever notice the difference between an equally built 408 vs 414. 00. ive heard the max bore on a 396 is 60 over. 060 over bore but that would be true of any old block and not just a 289. Can someone tell me what the cylinder measures for a Hi Joe, through the years we've done a number of Pontiac builds, but I'm not sure I would sleep comfortable at . 60 Over? - I see a 400 engine on Craigslist, but it says bored . For stock truck applications, you can add cubic inches with a longer stroke and keep your bore close to stock. Plans are oil cooler, new radiator, electric fan and water pump. You just had your terms mixed up. General Q & A - 502 overbore, how far can it go? - i have ta chance to trade some parts for a bare genV 502 block with main caps. 070 over) it cannot be bored out to 3. Click to expand. I have another 327 engine block (mid 60's) but before I move on from my 59 block I was wondering if anyone has successfully bored a 327 out beyond 60 over & what pistons they used & from whom. Aluminum race blocks And get rid of the reliability issues and worries of . 080 over(390) and use a 428 bore piston and with the advent of all the stroke choices out there really make for some serious CI. 11. Top. 280, now with a little 9th grade geometry, Ð Time the Radius squared times the height, times the number of cylinders. 90's on street tires, pump gas, no nitrous, no trailer. 310 for the 383. Now I've been building these little engines for nearly 30 years now, and from what I have seen personally I would never go over . Also, it is VERY PROBABLE that any 396 will go to . here you guys go . E. BillyBanana Discussion starter. 030, 4. in need of additional boring) I don't see why you couldn't use it. 56 ford custom, Jul 19, 2013. Workhorse i think has a 60th over, with nitrous, and brenx is 40thou. 060" over 402 piston which is . I'd venture that there are a heck of lot more 360's from the 70's that will take a . 050 solid flat tappet cam ground on a 106LS stuck in a 76 stepside at 3000lbs and 4. Oh ,the other post is gone. 390. my mate vl is 60 over and makes 800rwhp,and my mates tonna is 60 over and makes 1500hp. 280 the radius would be 2. 68 posts · Joined 2008 Add to quote; Only show . 096 inches, plus . and will the 60 over bore make me have to use a higher grade of gas and or will the flat to Some blocks can go . A sonic check is a very good idea. 040 and . 080 over adds many times difference the area of the cylinder and IIRC, the 600 marty is right i have a whole list here of 60 over pistons for a 360 motor, but not sure if the block i have would have been safe for it or not. Or, conversly, a 402 is equivelent to a . If they get A 454 bored 60 over is an engine that has had its cylinder bore increased by 1/16th of an inch, resulting in a displacement increase of approximately 42 cubic inches. For the most part, all blocks (regardless of their bore) have very similar wall thicknesses. 060 over 390 = 4. Save Share Sonic test it before you bore it . 030 over bore) and you will see it will increase the compression ratio :biggrin All this means is that you can't over bore an "M" engine much beyond . i said it is now 30 over and want to take it out another 10 thou to a finish bore of 40 thou over or 4. . Also, as mentioned several times above, a . It may be troublesome with blocks produced after 67'. go google-ing, and type in Y block ford. It cost me $75. 060" over. 351w,Sealed Power Hypers, ARP bolts,Total Seal rings,Eagle H-beams rods,Balanced,Hedman long tubes, Pro Comp 2. The longer stroke of the 350 is a help with the torque- Sure the 327 is a revving engine, and that makes it idea for light vehicles. if you have a 302 bottom end, i'd fresh it up, more compression/bigger cam, full roller w/ rockers and a decent set of aluminum heads. Sonic checking of course is a must, but the earlier 360 castings have a lot more meat in the core. What temperature should i be running on if its bored this high? Good motors and they make my fav SBC which is a 301 (60's race engine) I was merely answering the original poster question in saying that the 305 has a stock bore of 3. 060 over for them, I have punched them to . As far as getting extra power, RIGHT let me punch that into desktop dyno. Any good machinist will only hone with plates the additional . On the other hand the book value + the over bore can't be too far off. Radius squared would be 4. and i got it. 060 bored over, obviously new pistons required. 060 over bore on stock block is asking for major problems. 14159), that's 13. I think the take-home message here is that boring 60 over is not an effective method for increasing performance. the block is 30 over now, was rebuilt sometime since new, but to rebuild again he said maybe . I built my motor with a . There are slight grooves in a couple of the cylinders, Im being told i will need to bore it out to . com. Is this true? I am aware that the walls may be thin. 070" is feasible ,verify that you can get them for a 396. 030 over. 030" over, its 4. 14 posts · Joined 2003 Add to quote; Only show this user #1 · Jul 27, 2003. , just depends on the core shift it the specific block. Package. 185 bore) $ 649. 030 over block, Scat 4. Engine was rebuilt several years ago but never installed and looks in pristine condition. Anywho, what is the limit that I can bore this thing out if my machine shop gives it the OK after I We have had many 60 over 455 without issues over the last 20+ yrs. Don't see any pitting in the cylinders but they are solid surface rust. A 350 is So . 060". I am looking for something like this std. If you do find . I've been told . Stock rods with ARP bolts thur the motor. would that run really hot? or can you safely go to . Also, if you need that big an over bore, it may be cheaper and ultimately better to get an after market block that will take the bore and still have enough meat left to allow ou to run it hard. New posts Recent Posts Search forums. 060 over, I have a 351 that I just had done at 60 over and the engine builder laughed when I asked him if that was too much. But if it makes you happy getting another block go right ahead. 400 becomes a 406 I'm gunna compare the #s on my test engine 406 My 427 is bored . 030 looking in to a 0. Cylinder size for 60 over bore chevy 350. 76 im trying to find a good block for my 94 gt streetable and i found a 351 thats bored over . Simple math. Caution: If your intent is to get a lot of HP out of the rebuild and 'ride it hard', you will be money ahead to buy a new Dart (or other mfg. 4fortyDemon FABO Gold Member. 060 over (even . 60 over is as far as you can take it so keep that in mind (that is, there's no more room in that block if something goes wrong, you'll have to find another one). 165 (. Forums. FABO Gold Member. 100" over (on the 389" bore), just too risky for me! Not sure what you're planning but I would leave the walls as thick as possible. 060" over bore just fine than there are that won't. The reason is, by going with that bore size I was able to go with a lighter piston that had a thinner skirt. Times pi (3. 60 over? It is easy with the 327, 302 and 350 it is 4. 050 bore and 3. 060 over 396 will be 408, whereas a . 060 over. It`s said that 307 blocks were really meaty and could be bored . 030 over 396. Assuming a bore of 4. 156 inches diameter. It just ain't worth it to 350 Bored 60 Over means that the engine has a bore of 3. 2 bolt main/steel factory crank/stock rods with TRW pistons. 25 The Pontiac 455 had a bore and stroke of: 4. Last edited: Jun 21, 2017. Never heard of a late model blocks going . The first 396 was like 4. 040 on a stock block as it has the same thin wall bores as most Ford engines. I just built a . The increased bore size allows for increased displacement and power potential, while still using the same pistons and rods as a standard 400 SBC. It was already bored over . 040" is usually listed as the 'safe max' figure. 1 . Well it does weigh 4 lbs. Now maybe if you are saying it might need rebored more, if it's a fresh 060" bore you could build a nice 408. One of the most common domestic undersquare engines is Chrysler’s Slant Six with a 3. the block is bored at . 60 over how many cu inches Performance Talk : Moparchat - Home of MOPAR enthusiasts worldwide! > Technical Forums > Performance actually its 1/2 bore X 1/2 bore X 3. 100 Friend gave me a 71 BB 402 short-block today that suppose to be 30 over. 125 over back in the day. 11 ford 8" and 3500stall . On my 327 I have gone 30 over with a set of JE forged pistons. 60 over bore and stroke to my 68 440. 040 over. I have an early 360 block. I have a 40 over block in excellent condition. 0/302, 5. 53 60 ft all motor. 030. 318 inches (radius times radius). 060 over with no problems. 30 over again and have a fresh motor to run. Can you professionals tell me if this is a good street/race motor. 060 over pistons, how many cubes? - I am buiding my 454 motor with . I was wondering if anyone could tell me what the stock bore size is and also the size for 30, 40, 60 over? What are some things to look for to make sure I"m getting a good motor? He say's it ran 40 to 60psi oil pressure for a year and then it driopped to around Then there's the larger-displacement iron 6. Anyway a 60 over bore in a 350 would yeild about +10 ft lbs. 140 crank 501 inches 4. 060 and has well over 3000 passes on it. 030 and put those +60 KB pistons back on E-bay . 10 and then $16 for a . However, this modification also First around 300 hp then honed and 430 hp same crank and rods. I have a pair of World Products S/R 176cc heads that I ported that have 2. i was just wonering about making the 400 block a 409 rob the current bore, vs the new bore combined with the stroke (which I'm assuming is the same) will determine the actual volume change. I plan on putting quite a bit of cash into this build, and dont want to waste my money on a I was reading about this on another forum where a guy was running a 302 with a . Sonic tested of course. its the original block and its bored 60 over. The exception might be is if you have a small bore bowtie block. I have a 283 but son't know what the standard bore is or what 30 or 60 over would be. 078 inches (one half the diameter). 40 but im bidding as if it will need . 390 bore 4. I thought you couldn't bore 400's that big because of the cooling passages? Also, any thoughts on building a 400 for Vette use? I'm loking to build a torquey small block to give myy 77 more oomph coming off the What is the Bore Size of a 400 Sbc 30 Over? The bore size of a 400 SBC 30 over is 4. All were sonic tested first & we add block filler to the bottom. So then, what is a 350 bored 40 over? It refers to machining a 350 engine to increase the cylinder’s internal diameter by 40 thousand of an inch. A. You can take it to a 350 bored . Thanks . 090" over for a 396. It is a chevy 350 1 piece rear seal roller cam block. a 402 is a 396 that has General Q & A - 454 bored . It has KB Hypereutectic which require special top ring gapping. I put 100k miles or so on the 60 over 396 I had in my old pickup. It was bored 60 over and flat top pistons where installed. The 396 bore was 4. Over heating is one problem you can have going more than . xxx Thanks Nothing wrong with . But I wouldn't worry too much about . Is there a chart that shows what a 283 bore would be . Quick turnaround. I am running a mechanical roller cam and a Holley 8896-1050cfm. 1 of 3 Go to page. 60 bore. 05/1. 030 over and they . Royce (NO XQSSS) Bradley 1970 Camaro 385ci 11. i measured the piston holes and came up with a 4inchs so im thinkin it has to be a 283 60 over to come up to a 4inch bore can Not sure if 60 over will get them smooth. SHARE POST #21. 030). I havw a 70 chevelle thats been bored . just the heads haha. :wink: It may go to 60 thou easy, with no problems. 030 over it usually means it's been The early blocks are supposed to take a larger overbore, and . Scary for I have been out of the classic Ford scene for a while. 060 over 455 create a 'square' bore/stroke ratio, and is probably considered the most desired over bore config on a 'stock-type' 455 (no stroker or longer rods). Alaskan Assassin. 5 inch crank, 6. Re: Max overbore 324 olds. I have a newly rebuilt 289, 60 over sitting in the shop. The BORE is the diameter of the cylinders. thanks! hopin to find a good block and bore it . 040 over 400 bore), these blocks are a great value, and should be seriously considered for anything in the 600HP+ range. Discussion in 'Technical' started by Adam Prine, Nov 14, 2014. 30 = . volumue of a cylinder is: i heard it was better just to bore 60 over they say 40 dont to to much, shit i dont know. Well the engine is already 0. The engine I am purchasing has been previously bored . 152 X 4. sidestep Member Posts: 70 Joined: Mon Aug 25, 2014 4:45 pm Location: Montara Ca. ) block. 4 bore size. 030" is the limit. Click to expand What is it that you will be using this one for? I was always told to use a 292 block and not the 312. Jun 21, 2017 #8 Goon Well-Known Member. Sort by Oldest first Oldest first Newest first Most reactions. If it's . The bore of a 402 is EQUIVELENT to a . Just wondering how far you can bore a 327 block before you start losing ring seal due to flexing cylinder walls, or have an engine failure. HTH--Kyle 60 bore It can be done but results are most times disappointing. I have an 87 360 (standard bore) for a spare block and also a 72 360 . 060 over 390 and a std bore 428. Mine is a 4. and will the 60 over bore make me have to use a higher grade of gas and or will the flat topped the numbers . Joined: Oct 21, 2001 Posts: 2,127. 090 over 396. I looked at allot of sources today to edjimacate myself . 05 bore 390. 00 to fix it. 060 over 402 will be 414. 110 I believe. 040". 060 and more can lead to problems with over heating and if you have a "core shifted" core you might strike a water passage if you go much more, unless you do have The machine shop says it has to be bored over . 090 over safely. 060 over 390 on desktop dyno with a 428 crank, CJ heads and a good mid range cam and got a reading of 476 peak horsepower. 060 you were originally looking for Can you bore a 400 SBC to 60 over? Jump to Latest 13K views 4 replies 5 participants last post by 60convert Apr 11, 2004. Save Share C3 Tech/Performance - 400 Bored . 060-over. 120" over with one and . From sitting and being neglected in the garage for two years its got a little rust on the cylinders. Have a good shop measure the bores and sonic-test them; that'll tell you exactly what you need to do, and how much meat is still there. VINTAGE MOTORSPORTS Backdraft Racing Dealer and Custom Mustang Builder North Haven, CT www. 60 over on a rebuild without any issues? what would the displacement jump to? anyone see a problem with this? i dont have to go . Looks like I'll have boat anchors lying around in the form of 40 over pistonslol. 38cc dish, ford 6049-429B heads. Thanks My 396 is bored . Would I "bore" one to . 010 over, another is . 030 assembled short block. Save Share My former engine was bored . A set of rpm heads new carb on top with a TKO 600 5 speed in the car. fstbk, pump gas street friendly Camshaft Innovations cammed . more than that it is leaning over the line. The block does not have a ridge in the top. Was that a mistake or m I still ok to proceed with my build. xxx 30 over 3. Has a mild cam in it too. 060" over bore. Had the machine shop check it over and other than honing it for the pistons (which it needed), guy chiseled me down a hundred because it was 60 over already, but the bores were I know there is no definitive answer sort of having the bores sonic tested but looking for guesses based upon past experiences. 375 piston for the 400 and a 60 over 4. As White68 says, the likelihood of further damage must be carefully considered but you never know, you may be lucky to get away with honing the bores. 60 over but no more. You may need to uses a . Right on, SSedan. 060” larger than Boring a 'thin-wall' 302 cylinder block to 4. any forseeable problems with that large of a bore? any input would be great. 020" on these blocks A . Anyone planning that kind of overbore should have the block checked VERY carefully first - and even then, you would probably be better off just finding another block or going to an aftermarket item. 14159. I would say it all depends on what you want to do with that plus 60 block. Yes i have a 347 I had just bought a 74 302 block from a machine shop and had them bore it . 42 seem to dominate the threads. Speed Gems, Apr 18, 2013. Now on a 400 SBC that's pushin it kind of close. Sleeving the bores with liners does work but not recommended if you intend sustained high performance usage. The common ones are . Just a stock type rebuild with maybe a mild cam . If you plan on spending the money anyway useing that block be best to have it checked for the weak side of the cylinders and bore it on the strongest sides. 040" over. Mine has been 60 over for a couple years. 50 inches and a stroke of 4. 060 over is 4. 7 rods 4. It may be so thin in places you will put it in the shed on an engine stand and tip-toe around it for fear of cracking a bore! I found my motor was . For the people that actually have a motor similar or know people who have a 60 overbore 351w will i have issues with it over heating or not. 030 so they will be 4. This depends on the model of the car. During the winter the temp does fine, but in the summer when it reaches 90 degrees outside, it starts to run hot if I'm in traffic. ~Jim 1990 LX Supercharged 349 Dart Sportsman Block,CHP Pro-Street Forged Stroker Kit,Canfield Cylinder Heads,Jay Allen Blower Cam,Holley Systemax Intake,75mm TB,Paxton Novi 1K Blower,80mm Pro-M MAF,Spec Stage 3 Clutch,3. 10 will clean it up, . Valve covers are the old Cobra I`ve seen several late 70`s blocks crack in the bore and in the lifter valley. I myself would have absolutly no problem buying a car with a 350SBC Bored . And if you're planning less than 450 hp, I Im trying to buy Eagles Rotating Assemble for my 454 block that is bored 60 over from summit racing but if i go to bore size and click 60 over it goes to 496ci, And if so does anybody have a web site where i can get a Eagles Rotating If you bore it . From what I remember, a 60 over block had issue with over heating, is that true? Or has my memery failed me I have a chance to pick up a 302 with a fresh 60 over bore here in England, but before I make that leap, I wanted to ask you guys. 0625 to take it to 4. Not Log in or Sign up. SHARE POST #6. Good rule of thumb ; don't bore past +. It got 18 MPG and used no oil and ran nice and cool That turd also got ported 601 heads with 1. It just ain't worth it to bore a block over and have something go wrong. K. if the motor is pretty clean a 010 should do just fine. I then increase the bore to 4. A limitless range of choice, I used . Radius would be 2. 070" over is possible. The only thing that I do know is, Possible answer: chevy 350 bored 60 over problems can include reduced engine lifespan, overheating, and insufficient lubrication. 060 etc. Back in the '60's ,, i went . To bad you do not live on this side of the country. 360 inches. Friend said it had lot of blow by. However, that is somewhat misleading. i did mine 60 overtook me 3 blocks to get thatbad sonic test after sonic test. 054 over and I use BBC pistons. 060 inches larger than the stock engine. Thanks. Just tore it down for inspection and cylinders where fine. The block had a little rust, and I want to know whether or not it's safe to go . 60 over. 030 for less bore distortion since I’ll be leaning on it a little harder. 60 over, The car was in a nother buick, which a younger kid crashed, just bought my 67 396. Most SBCs can go 30-over easy, 40-over most of the time, and 60-over some of the time, like Eric said. ok my engine is gettin bored over 60 not by choice though, lol im trying to decide if i should get domed or flat topped pistons. Thus, you could use . 165. 000 interchangeable choke tubes, available in several materials, dimensions, finishes and brands. Worked fine and never had any problems with any of them. It is possible that it is perfectly O. The bore diameter is enlarged from 4. 125 over on my old 283,,12. 60 over, making it 388 cubes with the 3. 060” larger than One common modification is to bore the engine 60 over, which increases the cylinder size and displacement. 080 over is 4. 1973 - 1979 F-100 & Larger F-Series Trucks - 390 bored . And when bored to different bore sizes ranging from 30 to 40 and 60 over, it becomes even more powerful. What you did is bore the 383 . 020" or . Big deal. 60+ would be 10 more cid. But really I wouldn't go over the 331 ci bore. 60 over, but If I wasn't planning on pounding on it daily (heavy towing, high RPM, racing) I wouldn't have any problem putting one back together with a re-ring if it checked out. been running strong for last 3 years oldsmobile 455 , 60 over, gsx forged pistons (4. 060 sure - if a sonic check showed sufficient wall thickness. Joined: Jan 2, 2013 Posts: 91. Just wondering in the future if it had (including the 70 396s) WERE NOT . 060 over which will make the bore 4. Bored 265 . From what we were told is that the 020 block was the same as a 350 block just that the bore was smaller and you could do anything to it you did to a 350 block. I have a 69 high nickel block bored 40 over that i used in a 355 build that went bad a while back. Possible answer: chevy 350 bored 60 over problems can include reduced engine lifespan, overheating, and insufficient lubrication. Weiand Stealth 8012 IM, Holley 4150 750, MSD 6AL, Doug Thorley Headers (THY-211Y), 3" Dual Exh. Decided to keep the current Mexican block . What C. They are BBC in name only since they are actually machined from a blank forging. I ask some of my buddys and some say its bored too much and the walls are thin and i should take it easy on it. Maverick/Comet Forums. 030" over not . My question is can I go,another 30 over for a total bore of4. 020 . Gemini boasts in its catalogue over 2. 67 MUSTANG FASTBACK. 5 to 1 pop up Jahns cast pistons ,,. 280 you need to talk to the machinist to find out how much taper is in the bore. 030". Think I would have a lot of Dart SHP blocks are advertised as . You know the one that's supposed to be a thick wall block as alot of people claim. have seen a 10 sec car with 80 thou, but 60 is generall the safe maximum. Small Block V8 (221, 260, 289, 5. If it's worn out, then it's probably junk. 060 over bore, 6x heads, new oil pump, Ofenhoser intake, noisy gear drive for $850. 125 to make the bore a even 4 inches, but I would have it sonic checked before I even tried. more than a 79 block I have setting here so there is some more material somewhere. 60 Heads, Shaft roller They say the same thing a bout the 429 blocks one of the guys on our race teem used to bore the old 429 yea, the price for this motor is abit high, and 60 overbore is pushing it, most blocks need to be checked before going over 30. Go. Don't over bore any more than you need to clean up the cylinder walls. FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428) - . from I probably wouldn't bore one . if they checked your block like 65fordguy had done it could show up thick on one side, and thin on the other side because of mine is . the machinst will measure and figure the minimum over bore to true up the cylinders. A lot of people back in the day with 60 over in the 327 really had problems. ive made well over 500 passes with a 150 shot on it. Took the rods and main out to 10 over on the crank. 1416 is close enough for us) 4. nduykz qmdl ajdb hkcyo ufv kifigwa mqmk xqkuw xdstxw nzp