The difference in the hole patterns correspond to the L and R markings. With opposite rotation, the hole patterns are mirror images of each other. One hole in the one on the left is larger than the corresponding hole on the right. The size of this hole determines the limit of the centrifugal advance (25 vs. 8 ). A peg on the back side of the cam sticks into this hole to limit the movement between the cam and the shaft. The original C distributor had a 30 shaft but many were changed to 25 when the engine was upgraded with Fire Craters etc.
By the way, the number on the shaft corresponds to crankshaft degrees. Movement at the distributor is half as much.
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Today's Featured Article - Ford Super Dexta - by Anthony West. The rusty blue tractor caught my eye as my truck zipped by the farm implement business. It looked so fornlorn amongst the lineup of newer equipment. But it was just the right size for my small farm. I stopped in and asked the proprietor for further information. "It's a 64 Ford Super Dexta", he said. "It's a tough little tractor, although it's a hard starter being a diesel and all." He did manage to get it running, compliments of a can of ether. Once started it putted along pretty good. It
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