Cam lobe wear will reduce valve, lift (distance valve slides open). This reduces engine power and can cause a rough die. Camshaft breakage, though not common, will keep some of the valves from operating. The lobes on one end of the broken cam will not rotate and open their valves. Severe performance problems or valve damage can result. Removal of a valve cover will let you check valve train and camshaft action.
Worn cam bearings or journals will reduce engine oil pressure. Generally, this only happens after prolonged engine service. Normally, other engine parts will fail before journals or cam bearing wear becomes critical.
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