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.
Depends whether it needs lining or not. Some chimneys don't need lining but most will. Some stove fitters would be prepared to do a smoke bomb test in the chimney to see if there are any smoke leaks or not. If there are not you may be able to get away without a liner. I think it is probably recommended by HETAS to have a flue liner, for safety reasons.