99 z28, just put an ASA cam, ls7 lifters, new lifter trays, comp 7.425 pushrods, thunder racing ported ls6 oil pump, ls2 timing chain, had the 853 heads stripped/cleaned up by a machine shop, new valve seals, ls6 valve springs, ls6 intake, ported throttle body, long tube headers,true duals with a x pipe, plugs, wires, stall converter, front and rear trans seals, all new GM gaskets on everything, new GM head bolts. All of this was installed at the same time.
On first start up after adjusting the idle the oil pressure was 50psi or close to that, the problem is with in 20 minutes the pressure will drop to 0 - on the dash gauge, and the car shuts off. Let the car set overnight, next day 50 psi on start up and then it gradually goes back down to 0. Before starting it cold when we check the dipstick its full of oil, while running and the pressure reading in the mid 20's, after about 8-10 minutes of run time the dipstick is almost dry.
Also while installing these mods we removed the AIR, EGR, PVC, and A/C systems, Im runing a EPP breather on the pass side and a autozone small breather on the driver side in place of the PVC, I dont know if removing any of that could of had an impact on the oil pres or not.
Thunder Racing said the oil pickup o ring, so we checked and it was fine ?
Anybody have any ideas on what to look at for the problem ?
The car ran perfect before we did any of these mods, has 99,000 on it.