As I recall your original engine builder overfilled the block with hard block. The engine has oil pressure on start up but since it does not circulate water with a traditional water pump (block overfilled) the oil gets hot after idleing for 10-15 minutes and looses it viscosity. I believe I suguested you could circulate water thru the heads and run the engine for short periods of time. Or get a new block (that is not overfilled)
