Not Ranked
I was professionally wrenching when this change to unleaded and valve seats were a BIG issue. Everyone was panic striken, the sky was falling, were all doomed. Turns out the only folks I ever heard about that had trouble were "traveling salesmen" type. Folks putting a LOT of HARD miles on the engine. Running it long enough that way will eventually damage the valve seat. The face of the valve and the seat tend to weld themselves together. But that takes some pretty extreme heat, temperature AND a lean air/fuel ratio to happen. The way 99% of us drive our Cobras? AND we tend toward the rich rather than the lean side of air/fuel. Aint gonna happen, no way your going to have trouble with the valves/seats.
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