I'd expect the piston to melt before the spark plug. Do you check the gap when you check the plugs between runs?
Plugs looked great and the gaps were great too.
Other than the welded appearance, your symptoms sound alot like an ignition coil going bad. They work for a while, then start to arc internally as temp goes up. Then the spark deteriorates.
The part about deteriorating as temps go up certainly sound like my car. Can this lead to detonation?
JV ________________________________
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