Piston engines use valve rotators - part of the retainer.  I don't knowhow fast they normally turn the valve, and whether they explain what we
are seeing...
Regards,
Matt-

Interesting Matt, I've never heard of a valve rotator before..
I've only ever seen valve retainers in smaller engines so
my experience level is some what limited in that area..

Jarrett

Hi Y'all,
most piston engines have the point of contact of the cam lobe slightly
off center on the base of the lifter thereby imparting a rotating
motion.
This spreads  the wear area.
Cheers, Dave McC



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