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Quick question. Lets hypothetically say that I decide to stay with stock cast iron heads. How much would it affect performance if I didn't port them? Would simply installing biggers valves help with a nice combustion chamber polish? How well do the stock heads flow up to .500 lift?



Actually, as told to me by a few reputable Super Stock guys, the only reason to install larger valves in a production head, would be to fix a worn out seat. The 2.08 valves generate better velocity since the ports are so poor to begin with. Stock heads flow in the low 200s, they're good truck heads.