Not the best practice, Old timers with no money knurled pistons and fit them to an enlarged bore. It is best done when no new parts can be obtained. Few if any oversized pistons are made for IH letter series because they are sleeved engines. Loosening it up .005 will make it very noisy and probably break skirts on the pistons. Jim
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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