oil pressure

famous bob said

And YES, shimming the oil pump spring DID help my hot , low oil pressure !

Click to expand...

So big block? Been 38 years since I touched one LOL. But with the pump at the front of the block and if the measurement pickup is at the rear, that probably explains the low hot idle pressure.... it is at the far end of the system, after all the other pressure drops. How cool is the engine at these cold startups FB ? OK can be pretty cold in some parts during the winter.

I still can't quite see how shimming the relief valve helped it unless the relief valve is always open to some degree.... which I suppose is possible with the very high cold pressure.