Another benefit of the pushrod engine is it's relatively high power/weight ratio. People usually think of engines in terms of power/liter, but fail to consider how much the engine weighs. With it's one camshaft, one timing chain and sixteen valves there is less weight (and less weight that has to move) not to mention that it results in a much more compact package, which is great from a performance standpoint as it keeps the center of gravity as low as possible.
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