Originally posted by Ozziuteguy
Cheers mate.
would my 327 heads go on a 350 block as a 383?
May just have to look for a gunka 350 to play with.
Cheers
Shane.
A 383 uses a very large main journal Chevy 400 crank. The cranks are turned down to the nominal "large" main bering size used in 68 and later 327s, 305s, and 350s. To my knowledge, no one turns down to the small journal size. Forget about using your small journal block to build a 383.

327 and 350s have a 4" bore. You can use your 327 heads on a 383 but you need to watch your compression. In my opinion, you would be better off buying some aftermarket cast iron heads with hardened valve seats.

If your 327 is a 68/69 (late/large main journal crank)) version it will have a 2 bolt 350 block.

You can fit "splayed" 4 bolt main caps to a 2 bolt block. But it is expensive. The caps must be fitted, the additional bolt holes drilled and tapped, and the block line bored. You actually wind up with a block that is stronger than a factory 4 bolt. But why? 2 bolt blocks are good to over 400 hp.

My recommendation. Find a good 350 2 or 4 bolt block. Use an aftermarket internally ballanced crank and after market street replacement replacement heads.

I have a mild 350 in my roadster. Good heads, a little cam, and headers. About 300 HP. And that is more HP than I have guts.