Guess I stand corrected - But I will have to also say, I'm not brave enough to cam clearance steel rods after they have been manufactured.

FWIW, I will also use only aluminum in builds of that nature. When I inquired about moving to a longer arm in a standard height block, I couldnt find anyone who supported that idea, so I stuck with the 4.5 and the GRP's. (I have also used BME's)

Using the C fire pattern on a std core camshaft with the tightest BC I could get my grind on, I still had to clearance the already clearanced GRP's