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 - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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