Footnote refers to a specific part or application

Footnote #17

Warning - First Engine Runs

We strongly suggests that you use an old set of headers or set of cast iron manifolds for your first engine run / cam break-in.  This will insure that you will not damage the coating and void the warranty of your new headers.  Header coating damage usually occurs during the first engine run / break-in when the exhaust temperatures exceed 1200ºF.  Excess exhaust temperatures are normally caused by excessively rich or lean air / fuel mixtures and / or incorrect ignition timing.