Thanks. I used the same calibrated gauge before the
oil cooler and at the block tap. A real pia to unscrew and rescrew the fitting on the block. I foun oltoff offers a larger
oil cooler. It may be the cheapest route vs a bypass or thermostat. Having a hard time figuring a simple solution to bypassing the cooler. Will the limes have enough slack to pull together so I can use a union to test.
The pressure drop is so repeatable it would seam a hose flap wold be a little eratic. I will call the sho who installed the cooler fo 1500 (wtf) and determine whose it is as I cannot find any part numbers or other identifiers.