High oil pressure

[Edorsett]

I have a 1980 GMC Sierra grande with a 350 sbc and when I start it the oil pressure gauge is in the middle and after awhile this is where it ends up. What could cause this?


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[bd]

It is highly unlikely that at any defined, fixed or otherwise given engine RPM, the oil pressure would increase with an increase in temperature.  Hence, begin by verifying the actual oil pressure using a 100 PSI mechanical pressure test gauge, preferably tee'd off of the same oil galley as the factory sender.  Then as engine temperature changes compare the pressure indications of both gauges.  Once you've established a known baseline you can begin determining the cause of any differences.

[Edorsett]

Ok thank you I will try that.


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[bd]

BTW - oil pressure between 30 and 60 PSI for a stock engine is excellent, 30-35 PSI being quite common.  Once you've verified oil pressure using a proper test gauge, more precise help can be provided.

[Edorsett]

Ok thank you


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[JohnnyPopper]

Is it electric or mechanical?

If it's electric your circuit may be affected by 'heat' as in poor B+ connection or ground.

[Edorsett]

Ok thanks!


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[Edorsett]

Lol I did not wait long enough it went to the middle when it got up to operating temp sorry my bad


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