Oh, don't worry. I've learned more about rocker geometry in the last 5 days than I ever wanted to. Lloyd and I have been discussing the subject extensively. I'm debating hiring a medium to channel the ghost of Smokey Yunick to see what he thinks. I bought a new lifter to use for mock-up and blocked the plunger with a piece of bar stock so the running springs could be used, because the deflection caused by the spring pressure is a factor you want to account for also.

I was running stock PR length last year when this damage was done. The wear pattern wasn't perfectly centered but it looked "close enough". Roughly .100" wide and roughly .030" offset towards the exhaust side of head. Obviously that wasn't "close enough".

I used the 90 degree at mid lift method this time to give absolute minimum sweep, and then last night bought an obscenely expensive set of rocker arms that have the stud holes in the trunnions drilled .050" offset, so the roller tip will contact the valve closer to center.