2300x.050" copper h.g. This is a great head gasket but you will have to have your head or block or 0-ringed. The o-ring wire and install kit is SCE31542 @ $19.95. This kit will not cut the groove in the block or head, it is to knock the wire into the groove. You must also spray on Hylamar (SCE81998 $9.95 per can) to make it seal.