20/50 oil at .003 3in main clearance and .0025 rods seems to net around 35 psi hot idle and 75 ish psi at 6500 with a 80 psi pump. I used a .070 shim on the blower engine and nitro 50w oil. That engine was started at the burn out area and did not build much oil temp. 100 psi was common.
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