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.
If the gasket has a bead of sealer around the parts already, number 2 sealer can be used on the non-beaded side or hylomar. The beaded side should not need any sealer. On classic cars with a cookie sheet intake gasket, copper spray sealant or number 2 will work fine.