Ford actually doesn't state a value or minimum for compression readings. Instead they only state that compression measured between cylinders should be within 25%. Unless that's been changed and published somewhere.
Member of the Dropped Valve Seat Club.
Replaced #4 Piston, Rings, Rod+Bearings, AERA Re-Manufactured Cylinder Head and a light Hone. Then CLEANED the hell out of everything.
40k+ miles, now jinxed?