I've never seen it before
This is a cam from a GM Vortec 454 (7.4L) big block. It is a hydraulic roller cam. Noticed the #6 exhaust lobe is mushroomed round.
The engine was still running fine (albeit with a small miss) when the cam was removed. The pushrod was bent very slightly, the roller lifter looked fine, the rocker, valve, retainer, and spring looked fine. The damage was concentrated at the cam. No other visible damage to the engine - no sludge, no debris, nothing.
Really odd, isn't it?
