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Old 05-05-2019, 08:39 PM
Mike D Mike D is offline
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Join Date: Jan 2006
Location: Tucson, AZ
Posts: 5,358
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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