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I have a 2002 f225 txrb....the old powerhead had overheated and scarred the block and crank ( the way i bought the motor unknowingly). I bought a new powerhead and had it installed, and had the heads "trued" before installation. The problem is the oil seal (on top of the cam shaft) leaks now. The seal goes onto the shaft easily and is leaking. When the motor runs 4000 rpms just leaks some.....when 4500 it leaked almost a quart when i ran 50 miles...the crank case pressure seems to be ok, as it does does not "chooch" out of oil fill. Any suggestions would be great....have tried two different oil seals.