Throughout this site we use many technical terms, and given the breadth of readership our site enjoys, sometimes we are remiss and incorrectly assume everyone knows what we are referring to. For those that do not, here are some explanations of the technical terms use.
Cylinder Head Gasket
Thick washer fitting between the cylinder block and cylinder head to absorb minor manufacturing imperfections, act as a slightly-flexible seal to accommodate differing rates of expansion and provide a gas-tight and water-tight seal between head, block and cylinders. In some engines, there is no head gasket as such but waterproof washers are fitted in the waterways.