'72 Buick 455 Oil psi Drop - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-14-2003, 09:08 PM
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Post '72 Buick 455 Oil psi Drop

I freshly rebuilt the 455 and had made various oil modifications for higher rpm usage. The two main modifications were a high volume/psi oil gear set and a lifter valley crossover tube in the rear of the engine. I have the pressure sensor installed at the rear of the engine at the lifter galley. Initially, at a cold start I have 75 psi. After 30 min or so at 200 degrees, the pressure drops to 25 with 30w oil at 500rpm. AT 1000 it is at 50 and increases to 75 with a little higher rpm. Is this anything to be concerned about? I know the oil gear housing may be a little worn and scored and the pressure is being taking from the back of the engine, but it seems like quite a pressure drop for a freshly overhauled engine.

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Old 04-15-2003, 12:03 AM
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I`d say you have nothing to be concerned with, that`s outstanding oil pressure. at 500 rpm my small block chevy has about 11 psi with a high volume pump. the basic rule of thumb is 10 psi per 1000 rpm so your pressure looks fine, maybe even a little excessive.
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Old 04-15-2003, 03:17 AM
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Blieve me it's ok.....Steve
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Old 04-15-2003, 05:19 PM
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actually very good pressure for a Buick, these are known for the idiot lite blinking on and off at idle, the dealerships used to put in lower rated pressure switches so they wouldn,t get complaints from customers.
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