.080 over chevy 350?
.080 over chevy 350? this is just a question after seeing some shortblocks on ebay that were .080..i thought the max bore on a standard chevy 350 was .060? im not going to buy one, i was just looking around killing time at work today and ran across them. I dont think ive ever saw a .080 piston for a 350 for sale. im sure or obviously you can order them..i guess its for those dirt track people trying to squeeze every last ounce out of that "cubic inch" limit.
6 & 8 Second Club
Joined: Aug 2006
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From: Illinois, RT 66 dragway area
People have done dumber things. I have never gone or let any of my buddy's go more than .060.
But I'm a big fan of custom pistons. I go up .005 when I rebuild my big blocks to keep everything tight.
But I'm a big fan of custom pistons. I go up .005 when I rebuild my big blocks to keep everything tight.
i would think the block would have to be brand new and probably filled to the top with block filler, i personally dont like to go any more than .040 but thats just personal preference
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Originally Posted by wicked@boost
i guess u can go 0.0100 with a 454ci or 400ci blocks without sleeving. some one correct me if i am wrong.
In that case 100 over is Waaaaaayyy to much and the block is now worthless.
i ran a 505 bbc for a little while in my car which was a .100 over 454 block with a 4.25 stroke. i never had a problem with anything as far as ring seal or overheating but i have seen other blocks(454s) that shouldn't go over .060. i have seen an .080 over 350 before and it was a masterbuilt brand crate motor.
6 & 8 Second Club
Joined: Aug 2006
Posts: 2,284
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From: Illinois, RT 66 dragway area
BBC is way way different than a SBC. I have friends that have gone 4.375,
I would never do it but they have done it. Never more than 800 HP, and never on spray or boost. I have seen maybe 2 out of 10 crack, but they were low budget guys.
I personally have been .105 over on a stock block, 1000+ HP and many many pass'.
I was probably going to go 1 more rebuild at .110 over, but the crank split and took out that block. 505" is a very popular build with my buddy's. There are not many .060 blocks left anymore. We only used older blocks in those days, 60's-70's. I don't know anything about these new BBC blocks. Besides we all use big bore stuff now anyway.
There has never been a problem going .100 over on older blocks, and if you find a tall deck truck block, you should be all set. We have had great luck with them.
Back to SBC, I still say .060 is the max I would risk, and that's for a drag only motor, that will not see a lot of wear & tear.
I would never do it but they have done it. Never more than 800 HP, and never on spray or boost. I have seen maybe 2 out of 10 crack, but they were low budget guys.
I personally have been .105 over on a stock block, 1000+ HP and many many pass'.
I was probably going to go 1 more rebuild at .110 over, but the crank split and took out that block. 505" is a very popular build with my buddy's. There are not many .060 blocks left anymore. We only used older blocks in those days, 60's-70's. I don't know anything about these new BBC blocks. Besides we all use big bore stuff now anyway.
There has never been a problem going .100 over on older blocks, and if you find a tall deck truck block, you should be all set. We have had great luck with them.
Back to SBC, I still say .060 is the max I would risk, and that's for a drag only motor, that will not see a lot of wear & tear.
yea, thanks for the info 
obtw..this is the auction that sparked my question..
http://cgi.ebay.com/ebaymotors/350-C...spagenameZWDVW
obtw..this is the auction that sparked my question..
http://cgi.ebay.com/ebaymotors/350-C...spagenameZWDVW
Staging Lane
Joined: Jun 2006
Posts: 60
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having been in the buzz a while -- sonic testing is the only way to tell if the core has a shift in it -- that will tell you how thick a cylinder is SBC normally 200 thick or their abouts 400 sbc are thin some wont hold up to a stock 030 re build --- 427 454 block in a 4 bolt .100 and even .125 is not un heard of because they are plus .300 thick -- race motors BOE TY type sbc .500 thick and bbc Boes are .850 thick to start with so 4.250 454 bore can end up 4.600 and still have real race life in it i hope this helps == jz
12 Second Club
Joined: Nov 2006
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I have a 283 bored .080 over, but it is a 1959 block and it can go .125. I wouldnt try it on a 350 though. If it were possible to go .080 over where would you get the pistons? Custom jobs no doubt. I discovered .080 283 was limiting on piston selection big time. I think I will just bore it out the rest of the way to a 301. use 302 pistons. easier to get rings too.