Hyd Roller vs Hyd Flat tappet on SM heads

Turk,
You are heading for the World Record of getting it WRONG.
Firstly, nothing to do with DV. See if you can find anything in his writings/books like post #61.

If you cannot understand the simple premise that more valve lift will give a wider sweep, then you should stop building engines & only a fool would buy one from you.

Cookietruck understands my post because that part of it is simple geometry.