273 adjustable rocker arms

"Also with the pushrod and lifter not being 'in-plane' with each other loses .10 of lobe lift"

I din't think you meant to say the the lifter-to-pushrod angle would cost .100" lobe lift but rather .010" lobe lift. And it is indeed a pretty good lobe lift loss number for the angle.....it works out almost spot-on for a valve lift of .450-.500", when compared to the cosine of the lifter-to-pushrod angle.

That angle effect is included in my final number, just done with the cosine of the angle (typically 14 degrees IIRC), rather than a fixed amount of compensation. I didn't compute the effect of lash for a solid lifter into my measured ratios.