Valve tappet system, {HEAD ~ especially anti rotation bucket tappet} having {TAIL ~ curved cam follower surface} 
Valve tappet system , { HEAD ~ especially anti rotation bucket tappet } having { TAIL ~ curved cam follower surface }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL