340 max camshaft with exhaust manifolds

AJ,
The post #84 is a valid test. Cams were changed, nothing else. The DCR is useless figure, do not know why people use it because it is based on assumed flow of air into the cyl, not the actual mass that is trapped.
A test done many years ago using identical SFT cams in a SB Chebby, except for LSA: 106, 108,110 yielded similar results. 110 cam made 5 hp more at peak, but was down 20 hp on average power to the 106 & down 8 hp on the 108.