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BigBlocksRule · 01-10-2011, 05:58 PM

2-bolt 400's are stronger than 4-bolt blocks. The outer bolts cut through the weakest part of the main web. If it was run at .030, see if it'll clean up at .040 with a good hone job. If it has a ridge around the top of the bores, it probably won't clean up that way and is not a good candidate. Thin cylinder walls plus thin fire ring on head gaskets really restricts how much overbore you can get away with.
I've seen several 2-bolt main 400's at 500 - 550hp, but I sure wouldn't want to push it fartherr than that.

01-10-2011, 05:58 PM	#5
BigBlocksRule Registered User Join Date: Jun 2008 Location: Lubbock, TX Posts: 2,047	Re: 400 sbc price 2-bolt 400's are stronger than 4-bolt blocks. The outer bolts cut through the weakest part of the main web. If it was run at .030, see if it'll clean up at .040 with a good hone job. If it has a ridge around the top of the bores, it probably won't clean up that way and is not a good candidate. Thin cylinder walls plus thin fire ring on head gaskets really restricts how much overbore you can get away with. I've seen several 2-bolt main 400's at 500 - 550hp, but I sure wouldn't want to push it fartherr than that.