Thanks Slim, I sort of skip read the part about the wheel base, was looking for numbers rather than %'s but I think that makes me altered. (Sounds like something you'd do to a pet.)
As for what happened to my engine, the head broke. Three of the exhaust valve seats were blasted by detonation. The bottom end was sort of o.k., (the bearings were toast). It was a damn fine 35 mile motor.