oil pressure cold vs hot & cam stuff

BTW what rocker system are you using Mike? Dang, that is plenty of lift... just looking at the rockers!

Here: Low 70's psi priming with:
- A new Melling HV pump, the heavier relief spring, and oiling mods to the crankpins
- 55* F and 10W30 Brad Penn oil
- Drill RPM at 600 RPM
- Medium sized oil filter
- Stock type rockers and standard oil interruption to the rockers. (The cam being positioned for oil flow to the rockers or not did not effect the priming oil pressure. That oil flow is pretty low anyway with restrictions.)

Pressure drops to 60 psi hot, running, 10W30 with late fall temps in the Appalachains. Will expect a bit lower in summer.

As far as the original design.... limiting oil flow to heads is important for sustained high RPM's and pressure; there were a few engine out there that WOULD overpump oil to the heads and drop the pan level too low and the pump wold suck air: Vega engines were known for this problem when raced and absolutely needed head flow restrictors. Mike was wise IMO put restrictors in with his journal grooved Comp Cam... maybe not so much for preventing too much oil into the heads, but for keeping the pressure up in the #2 and #4 main bearings and in the rod bearings that they feed.