I have just rebuilt a Chev 350 that ran on propane. It is now on Gas. I have had problems setting the lifters and have discouvered that once the engine warns up, I lose the oil pressure. I have replaced the oil pump and still have the same problem. i have pulled the intake and looked at the lifters and they look good.
Any ideas what could be causing it?

Waggy
Chev- Sedan 36,Apache 59,Longhorn 69, Chrysler 300 - 1970 conv, Ford Prefect 49, International L130 1950
Surrey, BC, Canada