I can't remember what years had the most problems, but the first couple years had 5 bolt heads and blew the head gaskets, they all had a problem with sucking up base gaskets. Buddy of mine had an '88 I think for quite a long time, only problem he ever had was the base gasket problem, he would always silicone the thing up. I think Trinity would pin the whole base gasket to cure that problem, mucho $$ though. I got to ride it quite a bit, it was a beast.