SLIGHT LIFT AND LONGER DURATION THAN A STOCK CAM. THIS IS AS MUCH CAM AS YOU CAN GET AND STILL USE THE STOCK VALVE SPRINGS. IF YOUR GOING TO HAVE THE SPRINGS OFF ANYWAY I WOULD GET THESE TO GO BACK IN WITH (200149) S1199 @ e HEAVY_DUTY VALVE_SPRINGS WITH_WIDER COIL_SPACING FOR_HI_LIFT_CAMS IN_50_70_HEADS (GREAT_STOCK_REPLACMENT) (S1129) ALSO WORK TO REPLACE STOCK 50 AND 70 STOCK SPRINGS AND ADD SOME MORE TENSION S1129