my car has 141k, its a 97, taken great care of it, its a GSR, i run 14lbs everyday on the motor and its fine, runs hard as hell, i have ARP head studs and bolts and a inline pro 3mm headgasket and some hours on a dyno to tune all teh fuel work, mileage has nothing to do with it in my opinion

 

You need to do a compression AND leakdown test???

 

yes...