I'm with Shooper also... straight SAE 30 in my '59 235 .....My Pressure drops to around 10-15 psi at warm idle, but then the engine could use a complete overhaul.I did drop the pan and roll in new mains and rod bearings..Also installed a new oil pump.
"All right, they're on our left, they're on our right, they're in front of
us, they're behind us...they can't get away this time"
Lt Gen. Lewis B."Chesty" Puller, USMC
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