1997 - 2003 Ford F150 General discussion on the Ford 1997 - 2003 F150 truck.

best plug

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Nov 12, 2013 | 06:45 AM

#21

bobkyle2

Meaner than Ymeski

Joined: Oct 2009

Posts: 23,811

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sp504 is the only plug you want to run the 4.2.... I have 2, 4.2's ... Check your gaps, They will all be off...And there is a noticeable difference in this engine.

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