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Re: 2004 Ford E350 XLT 5.4L
Posted to Technical Discussion Forum on 3/23/2014 1 Reply

Vin L = 2 valve or older spark plug. Vin 5 = 3 valve or new style/high thread spark plugs. I have yet to see a 3 valve E-series & I work on a '11. Login to read more.

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