243 Valve Seats
#1
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.
#2
TECH Senior Member
GM dealers don't have them?
#6
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.