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Conventional

Conventional,there is one on racing junk in a 66 Chevy II that is 472. That is the biggest I have seen.
With my Motown block you can go to 4.200

If you use that new Warhawk LS platform they are talking 500 plus with it.
 

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I must a read wrong then because I thought I saw 472ci.:confused:
Dart only recommends boring to 4.185". I know some guys have bored them to 4.200" but they sonic check them first. Even at that bore you'll get 457 c.i.

You might be thinking of the SBF Iron Eagle. That can accomodate a 4.250" stroke:

4.185 x 4.250 = 468 c.i.
4.200 x 4.250 = 472 c.i.
 

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Yes, you can stretch them out farther at your own risk. Keep in mind that with bore and stroke stretched that far they'd be ok for pump gas, but they won't make great race engines. There's little material left between cylinders, tons of clearancing required for the counterweights, odd rod lengths and piston dimensions, etc.
 

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cn blocks makes the 10.2. bad mofo. 4.5 bore space. only safe way to get the big cubes. you can put a 4.75 crank in that thing. did some research on it. you can get heads from terrace performance that flow around 500 at 1 inch lift to make the baddest sbc ever. Those blocks bore to 4.33 safely to spray
 
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