I just finished dyno testing a new stroker engine for my Coronet. I used the retrofit lifters from Gaterman along with a custom Comp cam that Dwayne put together for me. I also used the conical springs from Comp and high quality 1.50 rocker arms. The engine was very quiet and pulled hard to 6000 rpm. It is a pump gas street engine and it made 610 hp and 630 ft-lbs of torque. Based on this experience I'm going to go with the Gaterman lifters for future builds.