it's not quite that simple...I remember a comparison Dulcich did with an identically built 408 and 360.Can't remember exactly but i think they used a stout cam and stock heads.There was very little difference between the 2 engines.
there is about 3 to 4 tenths difference at the track.
Ken Hensley and i had that conversation years ago, its proven correct on many combinations, including a couple of nine. The worse the heads, the less the difference obviously. I have swapped mild eddies and seen the difference Hensley mentioned
Thats a significant difference. Likewise, making a gear change one step, say 4.10 to 4.30, 3.23 to 3.55, etc, rarely makes much difference at all, and if it does, its minimal
