Upgrade spark plugs when changing manifold? Will be running flex fuel tune.

Discussion in 'V8 5.0L Engine / Mods: Bolt-ons, Exhaust, Tuning' started by Joe 5.0, Feb 17, 2018.

  1. Joe 5.0

    Joe 5.0 Well-Known Member

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    Just as the title states -- should I upgrade my spark plugs when switching intake manifolds since they'll be easily accessible? I will be running a Lund flexfuel tune and will see E85 once in a blue moon.

    Any performance benefits?

    2015 GT w/ 18,000 miles on stock plugs.
     
  2. AZStang

    AZStang Well-Known Member

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    I’ll be upgrading myself next week and would like to know as well.
     
  3. EFI

    EFI Well-Known Member

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    If anything, just check that the stock ones are gapped correctly. At that mileage and with those mods, you don't really need to do them but I have seen stockers range quite a bit in their gap from the factory.
     
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