Originally posted by Matt167
a head with bigger port's/ valves will not flow as good as a smaller 1 at street RPM's, so in a lot of cases actully, smaller is better
Matt167,you are right about one thing.Sometimes smaller is better for most aftermarket cylinder this holds true.In other words you can't put a 200 cc head on a 350 with a cam that is done at 5,500 r.p.m.s. Most performance SBC can use more cylinder head than a stock head.