Oil pressure loss at high rpm
Hi! Just keen to hear some opinions with an interesting issue I've had with my 77 Trans am.
Shortly after buying the car without a working oil pressure gauge I spun a bearing whilst having some fun including high rpm pulls.
I got the 400 motor rebuilt with an eagle 461 bottom end kit and fixed the oil pressure gauge.
From there any heavy acceleration past maybe 4k rpm saw the oil pressure start dropping from 80psi to 40 or less? Once I let out of the accelerator pressure would return to normal.
I think this may have been the cause of the previous engine failure. The only thing that stops the issue is dropping about a quart/litre of oil out. Pressure then stays all the way to 6500 but the engine has about a quart less than the specified 5 quarts.
Engine is happy below the low mark on dipstick
The engine retains the windage tray and factory sump.
Any ideas on what could be causing this issue when adding the right amount of oil?
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