[mrraford]

Ok, some advice please. I'm rehabbing an A engine to use as a spare (aka it's too cold to work on anything else) and in addition to the other repairs this guy needs a valve job. I've got all the necessary parts and supplies but during the clean up I've discovered that one of the exhaust valve seats is so burned up that it is not going to clean up with normal seat tools. I'm going to have to take it in for a machine shop to put in a new valve seat ring.
Who has experience with replacing one valve seat? Should I expect it to run with this repair or would I be better served to spend the money to replace all of the valve seats? Your thoughts please!