That block is indeed parent bore (has no sleeves). Couldn't find oversize pistons for my 504 about a year ago. NLA from CIH and couldn't find any aftermarket.
Put in new rings, turned the crank 10/10 and fixed the warped oil pump cover plate, had the head done and put er back together.
If you don't like undersize cranks, there are places that can weld them up and grind back to STD. Check with a GOOD machine shop.
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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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