i had a set of trw's in my old motor that were about 5 years old and many rebuilds...actaully after one freshning up i took the car for a pass and the meth connection at the map was not hooked up and did not know that at 28psi i was on straight pump gas and i ended up snapping the crank. upon taking it apart the trw's had small hit marks on all of them from the valves and on one of the pistons the skirt was chipped off..i grinded the small marks on the pistons and skirt and put back into motor and lasted a year and a ahlf going mid 10's with never a problem. i have always stated that trw's can take a hell of a beating and i now have a nice new set going into a motor im putting together for a freind