Compare Champion Copper Plug Number QL77JC4 Spark Plug - 828-1 Part #: 828-1 Line: CHP Champion Copper Plug Number QL77JC4 Spark Plug 2 Year LIMITED WARRANTY Seat: Gasket Thread Size: M14 Heat Range: 77 Hex Size (mm): 20mm Thread Reach (in): 0.500 Inch Center Electrode Tip Material: Copper Ground Electrode Tip Material: Nickel Service Number: QL77JC4 Metallurgy: Copper Show More Show Less
Compare Champion Copper Plug Number QL77JC4 Spark Plug - 828M Part #: 828M Line: CHP Champion Copper Plug Number QL77JC4 Spark Plug Manufacturer's Defect Warranty Seat: Gasket Thread Size: M14 Heat Range: 77 Hex Size (mm): 21mm Hex Size (in): 13/16 Inch Preset Gap (in): 0.028 To 0.033 Inch Preset Gap (mm): 0.71mm To 0.84mm Thread Reach (in): 0.500 Inch Resistor Plug: Yes Center Electrode Core Material: Nickel-Copper Alloy Center Electrode Tip Material: Nickel Ground Electrode Tip Material: Nickel Service Number: QL77JC4 Metallurgy: Copper Show More Show Less