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Old 12-22-2011, 09:16 PM
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Is my upper engine getting enough oil?

I can idle at 750 RPM with the valve covers off and not flick a drop of oil out the heads. SBC with Dart Pro-1 heads. Factory roller cam engine with Crane 109831 cam (intake lift .509 exhaust lift .528). Stock GM lifters. Crane 1.53:1 full roller rockers. Oil pressure at idle about 30 lbs. 50 lbs at cruise. 10W-30W oil. Engine temp 170 degrees. I adjusted valve lash while engine was running and could do so without the use of a cut-out valve cover, oil deflectors, etc. I do see oil comming up ea. push rod and on to the rockers. It seems to be enough to keep things wet, but compared to my Corvette with stock heads, these seem pretty dry. I would take a bath in oil if I tried this on my 1982 Vette. My valve train is a bit noisy, but only when I rev the engine. That's why I was checking lash. Does this sound normal for the set-up I have? If I blip the throttle with the covers off, yes I pepper the engine bay a bit. Also, is that cam too aggressive for the stock GM roller lifters (possibly contributing to noise)? I should add, oiling seems pretty uniform across tlhe valve train, each rocker seems to be getting about the same amount of oil as the others. Thanks.

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Old 12-23-2011, 01:09 AM
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That Cam is cutting it close.
There's an article in October 07 CarCraft ( The Secret of Cheap Roller Cams ) That has all the Info. According to Crane cams Director of Valvetrain R&D Mark Cambell valve lifts of more than .530" at the valve w/1.5 rocker can allow the lifter to fall deep enough into the lifter bore (because of the lobe's smaller base circle) that the steel retainer can lose it's grip on the lifter body. Crane sells long travel OEM style lifters to eliminate the problem, but they're expensive compared to stock lifters.
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