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  1. 390 occasional overheating

    Makin' Progress
    Don't know exact rpm. No tach, but it is geared really low so the rpm was pretty high. Timing is at 6 BTDC now with advance tube disconnected. Easy enough to up it a little and see if it helps. Thanks for offering some suggestions.
  2. 390 occasional overheating

    Makin' Progress
    Thanks Iowan. Worth a shot I guess.
  3. 390 occasional overheating

    Makin' Progress
    I'm stuck. Bought a 71' F350 motor home with a 390. 77,000 miles. It is overheating but not all the time. Drove up a 5% grade about 3 miles long and it overheated. Two days later, same outside temp, drove up a 5% grade about 6 miles long. No overheating. I have replaced the thermostat. The...
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