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  • Tom Blackmon

    Eugene, Thanks for your reply! The blower unit belongs to our church so I don't know if the plug has been replace before or not! The plug removed was a RCJ6Y 3/4" 14MM threads. All the manuals/parts break down  I found on the net depicts the RCJ6Y plug as the correct plug but the head  appears to be beveled for the spark plug hole. The plug washer appears to be slightly  beveled so I don't know if that will be enough to properly seat the spark plug or not? TomB