Reply To: Spark plug? -1937 Muncie Neptune O B12A

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March 28, 2023 at 10:24 am #274492
MIKE SIMS
Participant

    US Member

    From notes I have I can not see an OB12A, only an OB12. Earliest ’42 chart says an 6M, ’55 chart says 6MJ and my ’65 chart says K-15J