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need help with spark plug choice and tapered or flat

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08-18-2016, 10:01 PM	#8
garyd1961 Registered User Join Date: May 2016 Location: Henderson NC Posts: 975	Re: need help with spark plug choice and tapered or flat If 13/16 don't fit they have to be 5/8 plugs. I have never seen a 5/8 plug with a flat seat and washer. Pull the valve cover and get the casting number.

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