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Old 07-17-2004, 12:33 AM
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Small Block Oil Pressure

I rebuilt a 307 Chevy about 5 years ago. It is mostly stock internally with roller tip rockers, Comp Cams cam, edelbrock performer manifold, carb and headers. The motor has sat in this car and maybe...maybe has 1-2 hours of running time, mostly idling. I hooked up a $20.00 mechanical oil pressure guage, and the pressure seems to run at about 45 - 50 lbs while idling. It moves up and down a little while revving up to about 3000 rpm max, but not much. I have 10-40 weight Castrol oil in it which is fresh, maybe a week old. Does this pressure seem normal for a fresh rebuild or?????? I did not prime the system before starting, I just put some oil in the cylinders and after a few days, I turned it over a couple of times and then let it sit. After about a week, I fired it up. Overall, it seems to run fine. When I started it, there were no noises such as lifters etc. It does have hydraulic lifters in it as well. One other item. I noticed that the flywheel inspection cover had a small oil drip on it, I wiped it away and after running it a bit,it was back. Rear seal......I hope not. Do these ever possibly reseal themselves after some running?

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Old 07-18-2004, 03:40 AM
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GM stock oil pumps have 40 psi engine cold @ 2000 rpm
z-28 oil pumps have 60 psi engine cold @ 2000 rpm
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Old 07-18-2004, 06:05 AM
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Your engine has good oil pressure. As for the rear main seal this is a common leakage place on the older 2 piece rear seal small block chevy`s. When they sit they get no lube and tend to dry up, one case I seen where one sat for a a little over a year, when it was run again the rear main seal leaked so severe 2 quarts would be gone within 7 miles. When I build a 2 piece seal I always coat it with vaseline and let it sit over night, the seal tends to absorb the vaseline which helps it to retain moisture. The possibility of it resealing itself isn`t very good, you`ll likely have to replace it. You could try switching to syntheitic oil, some say they recondition seals, While I doubt this will work, you could still try.
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Old 07-18-2004, 08:29 AM
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Thanks for the replies. Any ideas on how to replace seal while upside down in ride?
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Old 07-18-2004, 09:32 AM
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Look at this thread.

http://www.hotrodders.com/t43020.html
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