Oil pressure-How much is too much?

80fbody said

I willing to bet the clearances are just fine. The high volume pump is designed to help out higher mileage motors that are loose. Toss in a HV pump, cam & headers & you've got yourself a hotrod. We just don't need these pumps on a fresh shortblock. I've been contemplating switching my hv pump out on my 451 build as my bearings are tight as well.

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Just us I guess..... but for street stuff running anywhere around 500-550hp and up to 6,000 rpm we target .003" vertical on the Mains and .0025" for the Rods on 10W-40 weight with "P" Eccentricity Bearings(up to 500).... moving the Rods closer to .0026" to .0028" on "H" Eccentricities past 500.
We then "set" Rod Side Clearances in pairs for oil leakage/bearing cooling.
With an HV Melling....typical Cold is 75-80 psi....moving to 40-45 psi Idle Hot with back to 70-75psi @ rpm... 170-180* F Oil Temp.

We get VERY SCARED of tight clearances for Bearing cooling reasons on these older generation Engines when making power.
IMO, .0015" Bearing Clearance is NOT satisfactory for ANYTHING !