243 Valve Seats
09-26-2017, 11:50 AM
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243 Valve Seats Does anyone know where to get 243 intake valve seats at. I am trying to replace 3 of mine and I can't seem to find any anywhere. The old ones I took out of the head measured 2.039 outside diameter with .400 depth.
09-26-2017, 11:55 AM
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GM dealers don't have them?
09-26-2017, 10:49 PM
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Your old valve seat should only be used as a reference for the inside diameter and depth. The outside diameter should be determined from the counter bore in the head. You need a bare minimum of .006" press fit (.006" larger than counter bore), but I normally shoot for .007-.008" with the larger diameter seats (2"+) in aluminum heads with most replacement seat materials. The other thing to keep in mind is the replacement seat will be a blank, meaning no valve job, so you would have to have a valve job done.