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i riecently installed a remachined and rebuilt eng into my vette. everything was machined and or replaced and resized, andi bolted it together with all new parts. i used a high volume oil pump and tacked the pick-up tube on. it has a mild crane hydraulic cam. i adjusted the rockers by priming the engine, with a drill on the oil pump, then doing the rockers at top dead ctr. zero lash plus one turn before starting the engine. i was told that this would work better than adjusting while running. i put 10w-30 in the engine to start and break it in. the oil pressure was high @ 60psi and would increase to about 80 on acceleration. evrything worked and sounded perfect and still does. however after putting about 500 easy break in miles on the motor, it still runs and performs great, but the oil pressure stays around 30psi at idle and @ 40 @2000rpm and advances very little beyond that, maybe to @ 60. that i know is about normal operation but why the big differance from the first start up ? secondly on start-up after the engine sits over night, the oil psi. takes time to rise, and there is considerable lifter noise until the oil psi. comes up, in about 5 seconds, then everything is fine. so what did i do? thanks for information. jim