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I have a Modified Small Block Chevrolet that I just purchased and sometimes when I'm driving the oil usually sticks around 40 psi but rarely it spikes up to 90 psi under hard acceleration, the engine has been broken in, is this anything to be concerned about?
High spikes is rather unusual, it's usually the low ones that are the problem. As it is, 40 PSI is certainly a concern as it's much lower than is needed to ensure the oil overcomes the centrifugal pressure head at the main bearing oil drilling and would be starving the big ends, the good news is if that were happening, you'd already know.
How are you spotting it, a gauge, logging, or other means? Is it simply straight line acc'n, or at other times as well?
I would suspect one of two things - the gauge/sender is faulty and under-reading for the most part - if electrical, check the ground path(s), especially if something else is on the same one(s), because ground loops (varying ground/earth voltages) can occur, especially with undersized or poor ground designs. Swapping the various measurement stages may isolate, or clarify, the problem.
The second is the oil pump pressure relief is sticking, but from the sysmptoms, I'd say that is VERY unlikely.
