No they didn't, but it was the rr engine and the slipper type tensioner that got Kenny looking for something better....like the mls headgasket! The dragracer will have one in it, Kenny believes in it, so do I. Wheels always the weak pt.....yes, if they wear out or distort cause of heat.100C going to distort or melt! Its the lower wheel that's the key along with material used.My .02. Bill