SS Engine Guy...good post...it is the discretionary application of the rule book that is the problem here. Also, you have a great point rregarding engine building, unless you do it yorself, you are at the mercy of the engine builder.
Regarding brows in the piston, I have seen NHRA pass engines that it is obvious the valve kissed the piston either due to over revving or due to a broken timing chain or camshaft pin. At the same time, I have seen people put an old cylinder head on the short block with old valves and smack each valve with a hammer to put an indentation on the piston and claim it was due to over revving the engine.
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