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Old 04-18-2007, 04:27 PM
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oil psi problem w/350

Hey, i'm new here and have many questions, but i'll just start with one for now. I have a 355 in my camaro and i completely rebuilt it last spring, new pistons, rings, rods, crank, bearings, and oil pump. It lasted about 2500 miles before i had to yank it out due to a loud thud. Turned out to be the thrust bearing was about .060 thinner than was when i put it in, and all the bearings were junk in the lower end. What i found out to be the cause of it was the pick-ip tube to the oil pump came loose (didn't fall off). Before i started hearing all the noise i noticed a drop in my oil pressure when the engine got warm. So after i found this, i replaced the crank and bearings welded the pick up tube to the oil pump and dropped it back in the car. i still had a problem with the oil press, so i yanked the motor again and installed a new oil pump thinkin i starved the pump when the tube came loose. Dropped it back in, and still had a problem. i decided to take it for a drive and see what happened with the pressure when the rpms were up. i drove it to work(which is about 13mi one way) and noticed if the rpms were up, oil press was alright, but not where i would like it to be. At 2000, i have about 30psi, and at idle (which i have set around 750rpm) i have about 8psi. on the way home i developed a mis-fire and determined that to be #8exh cam lobe was eaten so i replaced the cam and lifters now. While i was doing that i replaced the oil gauge hoping that was bad. i still have a oil psi problem, but only when it's warm. I even tried 20w 50 oil, still have a problem. When the engine is cold, i have no problems at all, 50psi at about 1000rpms. When it warms up it drops all the way to about 8psi. I'm starting to think it might be my cam bearings, maybe the oil is bleeding off when it thins out. i have a mechanical oil gauge mounted in the top of the block behind the intake. Any info would be great. Hoping i don't have to yank the motor again, i'm getting too good at it.

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Old 04-18-2007, 05:37 PM
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Did you check your rod and main bearing clearance ?
Yes, it could be the cam bearings also.
Use some plasti-gauge to do a quick check on the rod and mains. If they check out, you need to check them soft cam bearings.
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Old 04-19-2007, 08:25 AM
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let me know if you find out anything, i am having a similar problem.
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