Are you referring to the John Fenn who gave us PCB's? I knew he was a big player in the jet propulsion industry and did his major research in mass spectrometry (I won't lie, I had to look that last part up). I wasn't aware of his involvement with automotive fuels.
You moved in some heady circles.
Burnt valves are generally caused by timing, over heat or lean burn conditions. I have seen heads with detached seats and guides but every time it was due to an extreme over heating condition.
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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now
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