Mark - I've replaced several busted cam gears on Super M/400/450's. Aside from some heavy, awkward parts (front bolster assembly) replacing the cam gear is not terribly difficult for someone with average mechanic skills. Having an engine hoist or a front loader makes the job MUCH easier/safer. And you will need a 2-1/2" socket to remove the crankshaft pulley. Figure $150 +/- for a new cam gear.
Incidentally all the ones I've done have simply had the hubs break out of the cam drive gears. In all cases the camshafts, lifters, etc. were undamaged. Hopefully yours will be same!
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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