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Zex or E3 spark plugs

This is a discussion on Zex or E3 spark plugs within the External Engine forums, part of the LSx Technical Help Section category; I watched an episode of Horsepower TV where they installed a set of E3 spark plugs in a LS1 mule ...

  1. #1
    Junior Member SILVER BULLETT's Avatar
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    Zex or E3 spark plugs

    I watched an episode of Horsepower TV where they installed a set of E3 spark plugs in a LS1 mule motor and picked 7 hp on the dyno.Anybody out there running these or the Zex plugs?

  2. #2
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    2000 Z28

    Unless the original plugs are completely trashed, you're not going to pick up a measurable increase from a back to back plug swap. E3 is a sponsor of PowerBlockTV (as well as Royal Purple), of course they will be pimping them on their happy dyno. NGK TR55's are a good reliable plug at a reasonable price, or you could go with the IX (iridium's) for less frequent plug changes considering how much of a PITA it is.

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    Senior Member INMY01TA's Avatar
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    Ditto on the NGKs, Autolites are good also.

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