Changed plugs in 5.0
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5 Year Member
Joined: Sep 2015
Posts: 50
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From: North Texas
Changed plugs in 5.0
I changed my 2013 factory plugs with Motorcraft SP-534s. They are what 5Star recommended for tuned trucks. Also gapped them @ .045. I noticed a real difference in throttle response & truck idles smoother. Factory plugs looked good but were gapped @ .055.
Last edited by Russellb; Oct 9, 2016 at 01:36 PM.
