Sam the larger issue is at the bottom. The distinction is between the vast majority of SuperAs which were built with sleeves that were built with sleeves for a 3" bore that will accept the 3-1/8" overbore sleeves. A comparative few of the last SuperAs, before the SuperA1 which were built with 3-1/8 sleeves (same as the SuperC) that take the sleeves with the 3-1/4" overbore sleeves. The two are not interchangeable.
As far as fit . . . the correct fit is for a snug but not difficult push/twist of the soaped-up sleeves down into the dry o-rings at the bottom of the water jacket. At the top end, having the lip of the sleeve just a tad above flush is the aim, .003" to .007" is the range -- it gives the head gasket a little edge to bite into.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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