-strokecycle,agroupofpartscalledthevalvetrainopensandclosesthevalves(movesthemdownandup,respectively).(OHC)ValveTrainThecamisanegg-,calledthecamshaft,,thelobe,orhighspotofthecam,,,,valvespringspullthevalvetightlyclosedagainstitsopening,(OHV),whenthecamshaftislocatedoverthecylinderhead,thehigh-performanceengineshavetwoseparatecamshaft,-camshaft(DHOC)-rodValveTrainThecamshaftalsocanbelocatedinthelowerpartofengine,,,,itpushesthecamfollowerupward(awayfromthecamshaft).Thecamfollowerridesagainstapushrod,,theothersidemovesdown,--rodvalvetrainhasadditionalparts,-roadenginestypicallyrunatslowerspeedsand,consequently,producelesshorse-powerthanoverhead-camshaftdesignsofequalsize.(Remember,poweristher
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