Reply to "Stock Cylinder Head Flow Rates"

George PAdmin.

4V iron - PORTED

Valve Lift...intake flow cfm...exhaust flow cfm

0.100"..........70...................55

0.200"..........134.................97

0.300"..........198.................129

0.400"..........252.................154

0.500"..........290.................175

0.600"..........328.................191

0.700"..........352.................203

I've seen better exhaust flow numbers, in the neighborhood of 230 cfm, but that data is not available to me. I've had this data in my notes for several years. If these figures came from who I think they did then they are from a reliable source (someone who doesn't stretch the truth), its a home port job not the work of a professional porter, but he is a die hard Cleveland drag racer with experience porting a few sets of his own heads.

-G

8/29/098:54 PM

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