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Re: Info on rocker arm oil restrictiors for FE
I'm willing to bet it's excessive clearance at the main/rod bearings causing this. I have a old GMC truck with the same problem. Had the 305 rebuilt and the machine shop cut corners and did not send the crank out to be turned. Sure enough when I fired it up, 45psi idle oil pressure then after reaching normal operating temp 15psi at idle. Same problem I had when I pulled the engine. I ended up pulling the pan and bolting up a Melling HV oil pump and started using SAE30 which brought the pressure to 60+ idle at cold and around 20 hot.
The old timers used to say a minimum of 10psi of oil pressure for every 1,000rpm.
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