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Just another DuraMax swap
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Hear's a look at the fan shroud. The shroud is unusual as the shroud surrounds a second shroud that is attached to the engine which has a flexible gasket between the two. It permits the engine to move inside the main large shroud but maintains perfect blade tip to shroud distance. GM used this approach on their Duramax engines. This one was used on the 25" fans on later(2011-2016) engines


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