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