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And that explains why it is so difficult to get parts and advice on... thanks for everyone's help!

You may have a point there... I do believe it is a Buick, and I likely am wasting your guys time.... I am sorry about that....

Not to doubt on that, but that was one of the first things I went after. I rebuilt the oil pump and added an adjustable relief but that did not seem even touch the issue at all.

Hello everyone, I have been looking around trying to find some information on an issue I am having with a recently rebuilt 340. I have not even had an opportunity to break it in yet, because when if fires up it has great oil pressure cold. Once it warms up the pressure drops to where it will...