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.
Chevy now has a new manifold and gasket out to address this problem. They supposedly had to do it to meet the leakage requirements on the new. engines. I just did the manifolds on my '89 454 and so far, it is dead. quiet.