I have just replaced my cam (VCM 883), lifters (Crow cams LS7), lifter trays (OEM), pushrods (7.400 – came with cam from VCM), valve springs (Dual springs), oil pump (HP Manley). And something is horribly wrong. When the engine went back together, I started it and it sounded fine initially, but now sounds horrible. In short, there is massive lifter noise, and the top end doesn’t seem to be getting oil through the pushrods (it is almost dry, just some drops of oil). The oil pressure is fine when measured at the sensor port at the back of the intake (45psi). I did the work myself, but have had a mechanic now look over the car. He checked oil pressure, confirmed that sounds like the lifters have no oil. He had the rocker covers off while running the car briefly, and noted that it was dry. I don’t understand lifter pre-load on these cars – I just bolted up the drivetrain with the pushrods from VCM, and as far as I can tell, there is no adjustment. Am I missing something? Any ideas on what could have happened? The swap seemed pretty straightforward, but now I have this mess. Any tips are greatly appreciated before I pull the engine. Thanks!