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  1. Lumbar Jack

    M37 spark plugs

    Thanks for all the input. My '52 M37 (bought recently from a Fire Department) has Champion J11C plugs, no adapters, it starts and runs fine. Has a 12V system. What's the purpose of the adapters? Seems like I'm missing something..
  2. Lumbar Jack

    M37 spark plugs

    Can someone post specifics on what (if any) commercially available spark plugs are appropriate for M37? Thanks!
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