Thread: big block head flow?

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Originally Posted by steelsixpack101

Of all you guys that have experience big block chevy heads(mainly oval port). Stock 781's oval ports usually flow 250-260 peak cfm intake and 175 peak cfm exhaust. I wanna know on average how much they flow when you do port matching, bowl work, and three angle seats and a back cut of the intake valves?

Is that with you porting them or a pro. cylinder head guy porting them?It might be eaiser if you give us some engine specs. and we can tell you if the are even worth using.