amc 304 low oil presure

[hornetgeorge]

i have a rebuilt 304 motor with low oil presure and i rebuilt the oil pump.when i prime the pump manually oil presure gage will move.but with motor running it stays at zero .upper half seems to get little or no oil.

[donsjave]

Did you follow to the letter the engine rebuilding specs as outlined in the AMC Tech Service Manual??? The mains and rods bearings must be at the spec as outline in the manual. If your bearings are "loose" you will get oil pressure readings that are way too low for the engine. Personal expierence is that if the bearing clearances are set to GM specs, your 304 will be short lived. I found out the hard way and I have now adopted the pratice of plexigaging everything that requires it.