Well, see here, this speaks volumes.... and I appreciate your respect for 318's. But, in every thread I've ever read, there is a subject that I've never seen mention... and that is.... the consumption in the cylinder! Let me give a small tip: only about 85 % (on average) of what is brought into the cylinder is ACTUALLY burned. The 340 does about 15-20 % more cfm's at 5000 rpm's. Hmmmmmmmmmmm.?????......... So if a 340 is actually only consuming 84%, and a person can get the 318 to burn 98 %, given the fact that heads, cam, intake/carb and exhaust are equal, then the 318 does NOT need to "twist higher". You see, on the dyno, cfm's are measured, efficiency is NOT!!!!!! That's why gross horsepower went away and net came into play. Never mind, I should start a thread called "new light"..... and maybe I will..... hmmmm
