[Jay S]

The Elgin 909 sure looks impressive.

Right now the Crower 60919 and the Melling SPC-8 (white box 041s) are ground on different cam cores. Very obviously different cams today.

I have measurements from the last SPC-8 I did somewhere. As I recall it had 291* at .006” on the intake. My seat measurements on cams in factory blocks are generally 3 or 4 degrees less than a cam DR measurement. The advertised numbers (304 int, 315 exh) for the SPC-8 are .006” tappet at the valve, which takes into account the rocker ratios effect on duration. Closer to a .004” tappet duration depending on rockers ratios. I would expect a cam DR to show mid 290s int and mid 300s exh at .006” tappet on a SPC-8, but the centerlines won’t show much retard at the lower tappet lifts like the crane 041 and the 041 scan.

I would not be too surprised if a SPC-8 would have some slight assymetric's at low tappet lifts on a cam DR. The cam DR finds things that you do not always see checking something by hand.