I need to edit. I'm using 10-30. I was using 10-40 Royal Purple. But when I had my motor on the Dyno, the operator was uncomfortable with how high the oil pressure was with the RP 10-40. We switched to Penn 10-30 and it lowered the oil pressure by quite a bit at high rpm. Idle pressure held the same. I will try to find the info to put real numbers to it
Found it ...dropped about 38psi @ 5000-6000 rpms
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