well cronic came by shop this morning and we fixed a water leak. when i revved up engine i could see actuators moving and returning nicely. they are adjustable with the brass [sprinkler valve] i put on. still breaking in and have not tortured it yet. we put block off plate on, took acv off. does not backfire at all. https://www.nopistons.com/forums/pub...#>/BURNOUT.gif