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Oil with low ZDDP can be a factor but years ago when some OHV and OHC auto engines had epidemic failures it was bad materials..
Sounds faintly similar to Lario issues, though the cause is not necessarily similar. I DLC coated my cam/tappets in hopes of better wear. Is this something anyone considers Pete? Makes perfect sense, but pricey yeah. Kevin
Stock tappets are DLC.
Interestingly I'm finally beginning to see cam failures coming through in my shop. Things that are worth noting.4.) Long before the valves become really noisy signs of the demise of the cams and tappets will begin to manifest themselves by firstly misfiring and hesitation as the throttle is opened with no load at about 2,000-2,500 rpm, this is easy to overlook if you don't know what you're listening for. Secondly the engine will start spitting back through the throttle bodies, this can be both seen and heard, at idle. A drop of engine speed and a 'Chuff' accompanied by the physical rearward movement of the TB's between the boot to the manifold and trumpet to airbox.Pete
Clearances aren't the issue, believe me.Pete