Quote: Wow, that's 300 more rpm drop than my best guess So If we apply the 1* per 10 cube rule 360 to 408 lets say 5* more duration, about how much will rpm rise?
I'm a racer and engine assembler, not a engine sceinintest(SP ) or theoryist I can call Comp Cams race dept. tomorrow and get their engineers involved, if you want, That is who I use on new engine combinations for racing, PM me with more info on your total combination
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
So If we apply the 1* per 10 cube rule 360 to 408 lets say 5* more duration, about how much will rpm rise? 
I'm a racer and engine assembler, not a engine sceinintest(SP 
) or theoryist 
I can call Comp Cams race dept. tomorrow and get their engineers involved, if you want, 
