Thread: Still having complications

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is 108 the ccs on a 291 rectangle port head?

Originally Posted by Cooter1989

is 108 the ccs on a 291 rectangle port head?

about that.. the older O ports are less cc.your never going to get to 9.5 with the stuff you have less its not what you have with them heads a 4.530 bore x 4.250 crank your about 10to1.you have no crank stroke to build CR

o port heads? im confused. the heads i have are 3964291 they are gm's hi-perf rectangle port closed chambers

yes i know them heads i had them and used them in builds . i telling you that the old O port you would have a hard time getting to9.1 not 9.5 with a flat top and a 3.765 crank