Did a head and cam swap over the weekend, details in sig. Everything went smooth, did however break my breaker bar trying to tighten the balancer bolt! But i'll get to the point. My 162,000 motor still had the factory hatchmarks in all of the cylinders! Is this normal for these motors, or the result of good maintenance? Any one else with same result. BTW the cam is SSSSSIIIIIICCCCCKKKKK!!!!!!!