AD complied with in 1991. Hardened metal impellers and shaft are in this engine.
None of the material in the screen or filter are Metalic.
NOT aluminum.
Put a .060 chunck of anything under the oil pressure control valve ball and let the oil warm up to operating temp. >180*
The spring side of the valve dumps directly to the sump.
My pressures are now 75-80 at idle and 90 at 2500.
Thanks for your two cents.
BD