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Old 06-02-2009, 02:01 AM
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Pontiac 400 oil pressure

Hello everyone.

I just signed up to this site, i've been checking out the forums for quite a while.
And even though i dont own a hot rod, i would like to ask you guys a question, because you seem to know a great deal about cars, engines etc

My question is this:

I have a 1977 T/A with the pontiac 400 engine.
Its stock, except for an edelbrock performer intake and a pair of Dynamarc headers.
Do any of you know what the oil pressure should be in such an engine ?
I've read that 10 psi/1000 rpm is a good rule of thumb, is that correct ?

Thanks in advance

/Christian

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Old 06-02-2009, 07:04 AM
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Welcome to the site

I have also heard that 10psi / 1000 rpm is a good rule of thumb.

On my pontiac 400 (1975 Pontiac T/A) when the engine is hot at idle the pressure is usually around 35 psi. While driving it is around 50-60 psi. The bottom end on my 400 has about 130,000 miles on it. According to the Haynes manual, the oil pressure should be 55-60 psi @ 2600 rpm.

Hope this helps,

Ben
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Old 06-02-2009, 07:11 AM
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Hi Ben.

Thank you very much for your reply, much obliged

It is very helpful !
I think each car has a different oilpressure, but as long as the oilpressure in my car doesnt differ too much, im happy

/Christian
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