Well then, now it is apparent that you started out asking the wrong question, LOL. The difference between the 800 and 801 is little more than the paint and year. 98% of the parts are the same between the two. The model and serial number are stamped into the bell housing. If you stand with your left hand on the starter and right on the clutch pedal and look down you will see either 840 or 841 stamped into the horizontal flat surface. You can get most of the parts that you need right here at YT. In the interest of everything coming together successfully for you I suggest that you consider following the common practice of taking your block with cam shaft and crank to your local machine shop for cleaning, evaluation and prep for reassembly. They will take measurements to see if just honing is adequate or if boring is advisable. The bores are often tapered beyond spec. They will evaluate your crank to see if it needs only a polish or a grind. If it needs a grind they will tell you what size bearings to use. They can resize your rods. They can evaluate your camshaft and install the new bearings. If you want the insurance, and probably save some money you can order the bearings and rings and pistons if needed from the machine shop so that you know that they are all going to go together. Don't bother measuring your pilot bearing, clutch release bearing, or hub. Enjoy yourself and don't hesitate to post back.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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