Once the cylinder head casting has checked out good, we will need to resurface all of the valve seats.  This will change the valve stem height up into the cylinder head, requiring adjustment on mechanically adjusted heads.  This service creates a brand new concentric metal to metal seal with the valve face.  We also clean and prep the valve guides, as a pilot guide will be used for this process.  If the guide is cracked or replaced, we will need to use the seat and guide machine, and perform a 5 Angle Seat Cut.