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Add to CartNGK Standard Spark Plugs are proven technology that offer reliable performance. Standard spark plugs are treated with corrosion-resistant plating to ensure ease of installation and removal. The solid copper core offers superior heat dissipation, conductivity and broad heat range. NGK Standard plugs are an OE cornerstone that has provided decades of reliable performance.
Fits O/B - 1971-1967 MERCURY
Check your engine and maintenance manual for the correct spark plug and only use as recommended by your engine's original equipment manufacturer. Using the wrong plug can reducing optimum performance, reduce fuel economy or cause damage to your engine.
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
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