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      08-02-2009, 10:39 PM   #30
Mad Dragon
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Drives: 2010 GTI
Join Date: Mar 2008
Location: MD

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The N54 is an aluminum version of the N52; the construction of the blocks is virtually identical. There's no argument here; I've had all 3 engines apart.

N52: open deck, 2-piece block, electric water pump
N54: open deck, 2-piece block, electric water pump
M54: closed deck, one-piece block, belt-driven water pump