Just to follow up, the pushrod length and rocker geometry with the Harland Sharp 1.6 rockers is pretty darn good. The roller area is centered on top of the valve and measures .120" travel. Checked on a few, but here's one:
It's centered, but as mentioned it's way too wide.
That needs to be corrected.
Years ago the suggested perfect sweep from the Mopar drag race engineers at thier drag race seminars was from the inner third of the stem at closed to the outer third of the stem at max lift on both 3/8 and 5/16 valve stems
That was with ductile iron rockers also
Yes Cab, that advice would produce the least amount of scrubbing action on a ductile iron, or any, non roller tip rocker. It's a completely different animal with a roller. With a non roller, the contact point between the valve and rocker moves from the inside to the outside of the rocker tip. On a roller, it is always in line with the roller axle centerline. Mock them up side by side, and run them through a lift cycle. The geometric differences are very noticeable.
