THE ENGINE IS JUST A STOK 305 CHEBBY ON PROPANE THE TOP END IS COMPLETELY REBUILT SAVE THE VALVES AND THE STUDS...AHH NEW SPRINGS SEATS AND CAMSHAFT AND LIFTERS ALSO PUSH RODS ALL NEW WHEN IT WAS PUT TO TOGETHER PRE-SOAKED LIFTERS AND, INSTALL WAS DONE IT WAS ALL WITH GM CAMSHAFT AND LIFTER PRELUBE. SO I FIGURED I OVER ADJUSTED AT FIRST UNTIL THE SECOND PUSH ROD BROKE AFTER FIND THE TOP OF THE VALVE STEM ROUNDED A BIT AAND WATCHED THE ROCKER ARM DO A LITTLE DANCE ON TOP OF IT I WAS LIKE HMMM:AHHHH THATS NOT RIGHT...SO OFF COME THE HEADS TO FIND THE LIFTER SPRING IN THE VALLEY AND THE PLUNGER BEING HELD IN BY THE PUSH ROD PULLED IT OUT AND IT DOES NOT REACT TO PRESURE OR ANY THING SO OUT THEY ALL GO AND I AM REDOIN IT ALL EXCEPT THE CAM ...: