Have some rhs indy x heads that were setup by IMM.
Trying to start with the best rocker arm on these.
I have some PRW arms - 1.38” fulcrum length.
The other arm i was considering is the Harland Sharp built Mancini al rocker arms. Fulcrum length is 1.42”

These pics show where the PRW roller contacts the valve. Towards the intake side. Roughly .120” from stem edge on a .309” valve diameter.
Thoughts?

https://flic.kr/p/2mGXXFT

https://flic.kr/p/2mH35se

actually, i think this rocker will fit best..or atleast the Mancini Al rocker just won't be any better, just different...

quick calc has the PRW roller about 12% towards the intake side, then it should move towards the center as it cycles through the valve lift and perhaps back to where it started.

the Mancini Al arm is .040" longer, say it moves the roller out .030", that sets the roller at 2% to the intake side from the centerline of the valve stem. if the sweep of the roller is say .050" then it will roll ~14% towards the exh side from the centerline.