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 - Preventing Tractor Theft - by Staff. The discussion started with the following message: I have a JD A without key start or any locking device. Is there a best way to secure it so the chances of it being stolen are reduced? Following are some of the answers that were received: Take the rotor out of the distributor and hide after each use. The would-be thieves at least couldn't just get on and drive away.
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