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Is there a correct cold/hot oil psi for 656 Gas?

T

TX656

Member
On a fresh overhaul (turned mains and rods) I have 43PSI at start up and 22-23 PSI HOT pulling disk. This is on a 95 degree day at 1400 RPM.

I have the blue ribbon manuals and can find no PSI specs in them.

Mechanic friend did the reassembly for me (after I jacked up the first the I split it) said the machine shop did a wonderful job and the clearances were now spot on per the blue ribbon manual.

Oil Pump has been overhauled and there is a new pressure relief spring and all new metal check valves in the oil filter housing.

I was expecting more like 80 PSI cold and 40 hot (nothing to base that on except some car engine overhauls.)

Thanks
 
With 30 weight oil you should have around 40 psi hot at high RPM. There are a couple gasket designs for the oil filter base over the years and you have to make sure your new gasket matches the filter base not the block. An incorrect one will cause low pressure. Also adding the new metal valves in the filter housing can cause trouble as the seats in the pot-metal base wear and the new metal valves don't seat correctly. Its best to find a cast iron filter base from an earlier 560, much better design.
 
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