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.
Please note that there are parts mentioned in the video not included in the kit that you may want to replace for the service, those part #s are exhaust gasket #WCM100460L and # TYP500050 pan bolts (21 required).