Not Ranked
if it was a thrusting issue, I would think there would be more play up and down (in line with the rocker arm) than side to side. It is also possible that the finish on the valve stems is just rough enough to be slightly abrasive to the bronze guides. At 3000 RPM the valves are opening and closing 25 times a second, 13,000 miles is a lot of cycles, it would not take much.
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