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Champion - Copper Plus - Spark Plug fit for 1948-1974 Big Twin Copper Plus spark plug has a copper core center electrode that allows for accurate control of heat range, optimizing performance and longevity of the spark plug Patented SAC-9 semi-conductor resistor for maximum EMI and RFI suppression Patented Ultraseal™ coated shell for rust prevention Thread Reach: 3/8" / 9.5 MM Hex Size: 20.6 MM / 13/16" Heat Range: 12 Gap: .25"
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🇺🇸 Ship from USA · On Agora since 2025
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