.761" diameter tappes not interchangeable with stock diameter (.731") tappets or blocks Pan and Shovel "Powerglide" Tappet Block Kits are capable of the highest RPM a Harley can safely turn, at a valve lift of .700" with the right valve springs, valves, cam, oil, etc Pan and Shovel motors can have all the hydraulic benefits of the late EVO style hydraulic system by installing JIMS Shovel Powerglide Hydraulic Tappets These kits will eliminate the total oil loss of the stock hydraulic units, No. 17920-53A Sold each