I just looked at a part supplier and they did not say why they start at that serial number but I am sure it is when IH went to the larger piston pin. Apparently they feel it is not profitable to supply parts for the older original engines with small pins. So, that would mean you would have to find different connecting rods to use the later pistons. You could verify the serial number when they changed by looking in the online parts catalog for your engine.
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Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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