ngk 6239

  1. TADHemiracer
    Thread

    Question about NGK R5671A-10 Plugs, Where to Buy and Reading

    I have been using the NGK R5671A-10 stock number 5820, which is a silver colored or plated plug. I ran across some NGK R5671A-10 stock number 6239...
    Thread by: TADHemiracer, May 14, 2017, 6 replies, in forum: PSI Superchargers Tech Questions
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