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 - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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