ATI super damper?

were the pistons replacement pistons (ie Badger that weigh the same as stock) or Probe/Icon/KB/? lighter/heavier ones? if they were not the same weight as the ones that came out, then there is one possible cause. If you can take a piston out and weight it and compare it to published weights of a stock piston for that year 440 (69 forged crank 440 piston/pin weighs ~1086g) , then maybe youll get some good data.