not any more than any other blocks that I'm aware of. the set of cam bearings I installed didn't go in exactly square and so they moved out of shape a little so my cam was tight. i made a scraper , oiled it up , worked it in and out until it loosened up. (sounds dirty huh lol). I'm going on around 3,000 miles , running strong.
Ok, the guy at the machine shop said he was going to have to do some buffing to get the cam to fit right. I was just wondering if it could have been the cam or the bearings.