ok bear with me while i explain the events.... i took my truck out wheeling for a short trip, no problems with oil pressure at all. the engine was rebuilt about 2 months ago, the specs are 1988 SB 350 bored .030 nothing special old cast iron intake w/ thermostat choke setup with my QJet. HEI high volume high pressure oil pump Autometer mech oil pressure gage as the story goes, the truck sat for 2 weeks while i was gone on xmas break at school. as i cranked it over, i looked the gages over quick and noticed the oil pressure gage was at 15-20 and sweeping upward. as the ole QJet works, it never runs after the first attempt. the second attempt was running long enough for me to see the oil at 40+ psi. on the 3rd or so try, it was begining to run on its own and i looked at the gage as it was at 20 and falling. i dont have a tach, but it reving around 2000. i shut the truck off and go inside since it was cold and didnt feel like messing with it. the truck had 10W30 in it, i check the level before i started the engine, it was good. it was barely above zero *F. the next day i pulled the distributor to to see if the oil pump shaft still existed. i took at scewdriver and turned the pump by hand, and within 6 turn i saw oil moving up the oil pressure gage line. i looked at the dist. and i found that on the end of the dist. where the oil pump engages, i could see where the two became seperated and were not spinning together (dist. was spinning but the pump was not). the cam gear does not look bad from what i can tell by looking down through the intake, and the dist. has 2 different patterns on it, one considerably lower on the gear than the other. although the dist. was used in my previus engine. so the question is what caused this to happen. i am afraid to just put it back together and have it work again, i would like to be able to let it run in the woods for hours on end without having to stare at the oil gage.