[Formulas]

I tried the mid lift scheme when it became the new rage marking the side of a roller rocker and it took me in a wrong direction... Not all rockers are the same meaning the relationship of the cup and top of the valve tip vertically speaking from the rocker fulcrum they are not just about inboard / outboard points of interest so some brands of engine family's might work, In spirit mid lift is correct to give the smallest sweep on valve tip but you can observe the tip markings to get there is easier for me > on a Pontiac <