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.
For the 4.6 crowd, exhaust is not quite as important because of the physical sizes of the large engine and tight chassis. To put it bluntly, if a short-tube header fits in a 4.6 Mustang GT, the header doesn't work (that gem came from a Ford engineer charged with developing Mustang exhaust, so he should know). To make a 4.6 exhaust work-GT or Cobra-a long-tube, four-into-one header is required.