spark plug indexing

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    Technical Spark plug indexing

    Disclaimer: this thread not meant for debates on whether there are any hp gains from spark plug indexing When it comes to spark plug indexing I've heard 2 different "correct" ways to do it. Gap facing intake, and gap facing exhaust. Traditionally, domestic guys and NASCAR race teams have...
    • veer90
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    • n54 spark plug spark plug indexing
    • Replies: 15
    • Forum: N54
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