i was wondering what my comp. ratio is i have a 400sb with vortecs 64cc chambers. i know there is a way to figure this out but i have no idea n i know u guys do. let me know if u need any more info.

thanks,
nick

What pistons are you running? Deck height?

sry...internals are stock n the block was never machined

Stock 400 pistons were about -22cc dish. Compression on the stock engine was around 8.5:1 with 76cc heads. Changing the heads to 64cc (Vortec) with no other changes puts it right around 9.3:1

thanks Damon...so regular pump gas(87 octane rating) should be fine right?

Imho, should be..

pdq67