buffer (bÅ­f'Ér) Chemistry A substance that prevents change in the acidity of a solution when an acid or base is added to the solution or when the solution is diluted.
These Ford Racing Performance Head Gaskets are specifically designed for use with cast iron or aluminum cylinder heads on a Ford 289, 302, 5.0L, or 351 Windsor V8 engine.
Different kinds of gaskets, #4 indicating a Ford Taurus I4 engine head gasket. A replacement head gasket sitting loosely on top of a four-cylinder 1989 Vauxhall Astra engine block. Once positioned correctly the cylinder head will be bolted down on top of it, using a torque wrench.