Thread: Looking for Spark Plug Help
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Old 12-08-2023, 11:59 AM   #4
RichardJ
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Join Date: Apr 2010
Location: So Cal
Posts: 1,413
Re: Looking for Spark Plug Help
R44T spark plugs have a tapered seat. If the heads on the 283 are still the original '64 heads, it would probably call for gasketed plugs such as R44.
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'67 GMC 2500, 292, 4spd, AC
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