Seller notes

2 pieces Beru Silverstone S6 Spark Plugs fits Harley-Davidson Big Twin 1948-1974 14mm, 1/2 reach, gasket, 13/16 hex, Heatrange 5-7 STOP...playing around with spark plugs that feature fine wire electrodes, iridium electrodes,split electrodes, ring electrodes, multiple electrodes, platinum electrodes, copper electrodes,or gold electrodes, and get serious with silver electrodes! Silver is the best electrical and thermal conductor of any metal. This makes Silverstone™ the best spark plugs in the w...

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