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Early Y Block OHC 239 Spark Plugs
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07-19-2021, 02:36 PM
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40 Deluxe
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Join Date: May 2010
Location: now Kuna, Idaho
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Re: Early Y Block OHC 239 Spark Plugs
14mm. 1955 was the first year for the tapered seat 18mm. (If I'm remembering correctly)
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