Part Notes: For Heads With 18MM Dowel Holes , For Use With Overbored (OVR), Reman Engines Only. Not To Be Used On Production Engines , Includes Head Bolts. Does Not Include Dowels. , This Gasket Kit Can Be Used With 18MM Or 20MM Cylinder Head Dowels , When Changing Head Gaskets It Is 'Mandatory' That The 9229 Seal Kit Is Replaced