Actually, there may be a shred of truth to the valve warping theory. I remember reading a long time ago in one of the performance car magazines about how the 1/4 mile drag strip boys would immediately plug the ends of their "zoomie" headers after each run down the track. The theory was that plugging the headers would hold the heat in the engine and prevent the valves from warping and also prevent any potential cracking in the cylinder head and engine block. BUT, and here is the difference, those DRAG STRIP engines were extremely HOT at the end of each pass, much hotter than any M would get under normal use.
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Today's Featured Article - Talk of the Town: Repairin a Gas Tank - by Staff. This interesting discussion is from the Tool Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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