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Message: <blockquote data-quote="RichV" data-source="post: 997186" data-attributes="member: 17007">Well, in my experience I had a rebuilt 306 with a HV oil pump, startup was around 60-70psi. Hot would go 40 at idle, totaly normal for this motor. I actualy ran this motor in my SN with the said distributor. No issues, I actualy overheated this motor.So the new block with the same HV oil pump runs 85psi or so cold. But it does not seem to change even with the motor hot. One of the guys I race with builds motors, and his opinion is that the pump bypasses at 85psi, and it is allways bypassing, even when hot. That's why it never changes. I did also read up on people experiencing similar issues with HV pumps and this same block. I don't think it's a cam gear issue, but I'm not 100% either. I want to try the new pump, I think the gears started getting fubared right after I put it together.</blockquote>