I seem to remember reading that the rocker pedestals are not all the same, only #2 and #4 are drilled for oiling. If they're mixed up then no oil to the shafts. It will assemble OK, just no oil flow.

We searched around and are going with small block Ford valves for our 331 rebuild. Stainless steel Manley Race-Flows for half the price of the stockers, using the 1.55" Exhausts and 1.85" Intakes (both are 0.05" larger dia than stock). I'd go with the more standard 1.60" and 1.94" diameters, but I just can't find any data on the seat/casting thicknesses for the early Hemi.

Since we're replacing the guides we're just using 0.3415" dia instead of 0.375". The Ford lengths are just a little bit longer, the machine shop trimmed them down 0.015" on the Intake and 0.060" on the exhaust. Going to Ford parts for the rest of the valve components as well.

Cheers, Mark