Post Thu May 28, 2009 7:30 am

Flathead power UL cylinders.

I used FP UL cylinders on a 40 UL project. 600 miles,ridge at top .010,trough worn in both wrist sides, not thrust side, about 1" wide top to bottom on both cylinders,piston pin relief hole wallowed out.All wrist pin keepers intact.Clyinders bored to .003 clearence.Much aluminum chips in engine.Never seen anything like this in my exprience building motors.Bad cylinder meatal?THANKS.