Rocker Priming: Odd Cam Oil Hole Angle

Those are some very good ideas, Moper. One reason we installed the cam bearings ourselves was to get these cam bearing holes well aligned and we did a good job. (Easy to make a tool with a long 1/4" threaded rod, some wood discs, and a large flat washer. Just a little extra driving needed on the back one.))

As a side note related to oiling capacity through the cam: we are using (trying out) the AL PRW PQx rockers. The clearance in the shaft holes around the mounting studs that allows oil in from the pedestal is very small compared to the stock hole; the net flow area into the rocker shaft is only 0.1 sq in as opposed to 0.35 sq in for the stock rocker shaft hole, and 0.45 sq in flow area for the hole in the block from the cam bearings. Plus the total oil flow area out of the PRW rocker shafts to the rockers is also only 0.1 sq in. So, lot of flow is not needed as it is restricted; I wrote to PRW and they said that they keep that clearance hole small for oil restriction. (I can only assume that I got good info.)

We are planning to drill some new oil holes in the PRW rockers to shoot oil to the rollers and springs tops and valve tips, based on general comments on this and Dart Vader's experience. So we'll open up the rocker shaft's clearance hole to the pedestal to around 0.2" sq in to support that added flow.