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Fired the 340 for the first time last year, ran good. Oil pressure at idle is around 40-50psi, when the revs come up it's reading close to 80psi, that's off a gauge on the back of the block. I'm aware of the 10psi per 1000rpm rule of thumb but is there such a thing as too much oil pressure. Do I have a problem?

you may have a problem, have you ran the motor enough to get the oil up to operating temps yet? If so what was the pressue then, hot idling and revved up above 2000 RPM with hot oil? Most Hi Po oil pumps bypass springs and valves are set at 80 lbs, not good to open that valve under WOT acceleration I have had to cut the springs down or change the springs on SB pumps to get them to have acceptable oil pressures such as you refferenced in the 10 lbs. per thousnad RPM rule Most good SB engine builders don't use the high pressure or high volume oil pumps any more for that reason, they have the high pressure springs in them

Last edited by Cab_Burge; 03/15/12 03:06 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)