My 1975 ford truck with 351M Engine eats the distributor drive gear up. I already changed the cam and gear, but it still does the same thing. What could the problem be?
Either the cam thrust bearing or the cam journal bearings are sloppy, allowing the cam to move in all sorts of interesting ways when the engine is running. End result is the gear gets eaten up, or worse, the cam gets in a bind, and breaks.
Replace the cam bearings. If it's an extremely high-mileage motor, consider a full rebuild. After all, it is over 30 years old.
