RACING SPARK PLUG R7420-10Part No. R7420 10 Type SPARK PLUG Brand NGK SPARK PLUGS Unit of Measure EACH Description NGK Racing Spark Plug Warranty No Warranty Seat Type Gasket Thread 14 Reach 21. 5 Hex Size 20. 8 Resisted Yes Gap . 7mm OEM Number 5501 Features NGK Racing Series plugs are engineered to withstand the harshest engine conditions Standard nickel centre electrode Corrugated ribs reduce the risk of flashover Pure alumina silicate ceramic insulator, provides superior
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