Agree, PW&R. Valves, rockers, pushrods, fuel pump arm, et. al. move at 1/2 rpm with camshaft. Both valves stop completely for 360 deg. (comp & pwr strokes) not stop EACH 180. Dick -----Original Message----- Subject: Re: Sunday Trivia > 1>Piston, Wrist Pin, Rings...Not rod big end always moving ! 2>How about the piston, intake and exhaust valve
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