The original fire crater sleeve and pistons sets for an H or M cam with a new distributor shaft, springs and some came with a different dist cam. Included with the dist pkg was a template to mark the front pulley at 22 degrees btdc. On the M it was 1 7/16th inch from the tdc mark. I remember it well as I did several of them. Then you timed the engine running full throttle to that 22 degree mark. Also, the springs were somewhat touchy and a lot of them would advance about half of that distance at a low idle. I usually tweeked them so they stayed closer to tdc at low idle for a smoother running engine. I remember one of our good customers who did a lot of tractor repairs for himself and neighbors, put in a set in his brother m and it had no power at all. Well, he was in the habit of timing with a light at low idle and ended up about 10 degrees short at full throttle. Easy fix. The kits for the 300, 400 etc did not include dist kit at the 300 was already at 22 degrees and the 400 was 25 which IH felt was close enough. If you left the origial 40 degree dist advance in a M you had a detonating son of a gun. Some did that because they didn't want to monkey around with the distributor. There was also a new main jet and different adjusting needle for it that had a different angle on the taper.
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