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Found out my 1968 F100's original points gap spec was for leaded gas, not unleaded
I was reading an old shop manual from 1967 at a swap meet in Ohio and it said the factory .016 gap assumed leaded fuel, which surprised me since I've been setting mine at .019 for years and wondering why it pings, anyone else run into old specs that don't translate to modern pump gas?
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the_nathan22d ago
Ah yes, the classic "the engineers in 1967 knew something we forgot" discovery. Setting it at .019 to compensate for unleaded is basically the old timer version of a software patch, you're just band-aiding around the fact that modern gas burns different. The pinging is your motor telling you the timing curve and the gap are fighting each other now. Hate to say it but the manual was written for a world where gas had lead in it and dinosaurs roamed the earth. Your best bet is to bump the gap down closer to spec and mess with the timing instead, or you'll be chasing that ping forever.
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