You'll want to order the seat that is larger than the hole it'g going into because it needs to be a press fit. Without any real numbers it's impossible to say wether your going to need to have any machine work done, but typically you'd want fairely tight press fit on something like that so your probably looking at a seat that would be about .007 larger than the hole for aluminium heads, and about .005 larger for cast iron heads.
Here's a link to a place that carries the cutters to prep the heads for an insert. The info I just gave came straight from their site.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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