Not Ranked
The heat treat could be too hard. How is the lash on the rest of the valves? Another possibility is that that valve lost the lash for whatever reason then the cap broke in half. My guess would be the first.
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Jeff
“If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower.”
Mark Donahue
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