Pushrods 30 may be engaged with {TAIL ~ the camshaft} 26 to actuate the rocker arms 32 and selectively open {HEAD ~ the intake and exhaust valves} 18, 20 
Pushrods 30 may be engaged with { TAIL ~ the camshaft } 26 to actuate the rocker arms 32 and selectively open { HEAD ~ the intake and exhaust valves } 18 , 20
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH