Peer closely enough at almost any vehicle on the road and you'll most likely discover DuPont Automotive fingerprints somewhere. And in the case of Ford Motor Co.'s 5.4L SOHC Triton V-8 engine, they left a particularly significant one. The 5.4L dons the first North American application of a multi-piece, vibration-welded nylon 6,6 lower intake manifold. Found in 1999 F-series pickups and the Expedition and Navigator sport/utility vehicles (SUVs), it replaces an almost identical part ...

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