406dynographpull7 though I did not have a Dyno tune done ,this was what the average 406 like mine was pulling for hp an tlbs ,after it was found I was sent a test engine ,that was to be sent to another customer ,they said your welcome for the forged parts during speed week from karl performance ,an race week around the first 2 weeks in august 2014 I got this from them about 2 months later ,they also said this was an 81 Camaro with the 406 was one of there test cars RWHP RTLBS,i have thought about takeing mine to be done ,but I feel enough power to know I am very happy with whats under the hood ,will see one day is day trip ,only 3 hours to get to a dyno tune ,but it takes a awhile too ,epping has a few places to get one done,they were also thinking Camaro 92 on back ,not 93 -02