The Head Shim is 1.2mm thick and is designed to extend the life of a head which is thinner than the minimum specification. The shim is placed on the block before the head gasket and will raise the head 1.2mm. Use Permatex Copper Spray-A-Gasket Sealant on the head and bottom of the shim for an excellent seal.
Head gasket shims have been used by vintage engine builders for many years and is a proven technology. (Back in stock)