[Toreadorranger]

Is there a factory 4bolt main 454 block that would SAFELY take a 4.25" stroker crank with a .100 over bore? (505ci, I think my math is right.) I'm not making a race car more of a fun/cruiser but something about 500ci+ that just sounds good in my head.

 

[CenTex Chevelle]

I would have to check my notes but i think the casting number you want is either 502 or 512. Send me a PM and I will check for you.

 

[MEJ1990TM]

A four bolt main 3963512 454 would be an LS6 I believe.

 

[Mike]

You really would need to sonic check any block you want to go .100 over.
Why .100 and not .060 which would be acceptable on just about any 454 block.
Go 496 and call it a 500

 

[Toreadorranger]

Im really just looking at options right now. I'm starting my search for a 454 block to build a stroker with, and I'm unsure of what bore I was going to go with be it, .030, .060, or .100. I wanted to see if there was a specific block I should be looking for to leave these options open. I know the first two any 454 block will do as long as its in good shape. Just wasnt sure on the .100. I might just do a 4.25 crank with a .030 bore. Something about a 489 I think sounds good in my head. Maybe just seems a little less popular then a 496.

 

[the heckler]

get a merlin III and just build you a 496 with off the shelf parts...

 

[dyno jonn]

Get yourself a 10051107 block and have a ball. http://www.popularhotrodding.com/fe...family_zl1_big_block_chevy_history/index.html

 

[COPO9560]

A four bolt main 3963512 454 would be an LS6 I believe.

3963512 4 bolt was used for LS6, COPO 427's, L-88, L-72 and L-79. 512 blocks are kind of expensive - better collectors items for Vette and COPO crowd than using for a 100 over build.

 

[Busted Knuckles]

The 289 castings are rumored to be among the thickest. Mark (Vortecpro) has said that the first 454TBI engines used the same 14015445 casting as the LS7 crate engines, that would be one to look for. Don't limit yourself to 4-bolt blocks, a good, thick 2-bolt with splayed mains would be better...

 

[MEJ1990TM]

3963512 4 bolt was used for LS6, COPO 427's, L-88, L-72 and L-79. 512 blocks are kind of expensive - better collectors items for Vette and COPO crowd than using for a 100 over build.

I know multiple blocks got the same casting numbers. Do 427's have the same bore as a 454?

 

[CHITOWNHUSTLER]

I have a 512 block that is a 100 over and has been sonic tested
and could safely go 30 more. Mine is not stroked 477

 

[GoatDr]

Why not just go 60 over and use a 4.375 stroke and make a 511ci? Needs some clearancing on the oil pan rails and cylinder bottoms. No worrying about cyl wall thickness. I'm running about 600-650hp in a two bolt main block.

 

[Jebchevelle]

I had my block soinc tested its a two bolt and true story the shop that sonic tested it wanted to trade me a 4 bolt one and some cash I just smiled and said nope Ill take my $50 block home with me thanks, and I did. Its the 468 in my car now. The reason they wanted it was after the sonic check, they said it will go .125 over no problem. So like said a bove dont just look at 4 bolts might find a good buy on a 2 bolt that is worth splayed mains. Infact next tear down this ones getting splayed mains and going 540CI. And no bull I gave a guy $50 for this block sight unseen because he didnt want his race buddies to get it. So he offered it to a fellow employee at his work who is in the same car club as me. My friend told me about it I said sure ill give him that for it and the next day he dropped it off at the club house lol. Good deal for me. By the way its a GM replacement block not a crate one it was .020 when I got it. I went .060 knowing later I would go .100-.125 with it hence why I kept it. FWIW

 

[bracketchev1221]

The reason they wanted it was after the sonic check, they said it will go .125 over no problem. Infact next tear down this ones getting splayed mains and going 540CI. FWIW

+.125 is only 4.375 bore. To build a 540 you would need a 4.5 stroke crank. Most 540's are built 4.5 bore and 4.25 cranks.

 

[Busted Knuckles]

Yeah, jeb, you ain't going 4.500 with a non-siamesed block, the cutter will be spinning in air a long time before you get there.
That ain't to say you don't have a very good block, it just ain't gonna go that big.
Sounds like it'll make a killer 505, though...

 

[GRN69CHV]

Back to the OP. Unless you will drop the $$$ for aftermarket. there's no big gain in going above what the bore will clean up at. My block is a 289 code bored to 4.320 (.070). It'll take more. Even at 4.320, that's a 498 with a 4.25 crank. To go 505, you're looking at another .015" out of the wall. The added .015" of a 4.350 bore is not going to flow any better than than a 4.310 or 4.320 bore.

 

[jhunt]

Back to the OP. Unless you will drop the $$$ for aftermarket. there's no big gain in going above what the bore will clean up at. My block is a 289 code bored to 4.320 (.070). It'll take more. Even at 4.320, that's a 498 with a 4.25 crank. To go 505, you're looking at another .015" out of the wall. The added .015" of a 4.350 bore is not going to flow any better than than a 4.310 or 4.320 bore.

I agree with you and thats what I did and it seems to work well. Plus, parts are more plentiful with a 496/498 than the odd number ci blocks.