advancing spark - 308
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Page 2-14 Hudson Tune UP procedure

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I’m my experience I’ve found the 308 engines are sensitive to ignition timing. I advance the timing untill on a test drive the engine pings under load, then retard the timing slighty so that the pinging stops.Run the highest octane fuel you can get. Mine runs great on 91 octane fuel but it will ping on 86 octane fuel.
Dave0
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