Tempest Aviation spark plugs (made in the USA) include a glass center seal with a resistor which replaces the multipart screw, spring, carbon pile stack up known to suffer misfires, wasted fuel, and engine roughness. The plugs finish is an environmentally preferable electrolytic nickel that provides durability, corrosion protection, and wear resistance. Tempest Massive Spark Plugs ($21.50) and Tempest Fine Wire Spark Plugs ($49.95) are available from Aircraft Spruce (877-4SPRUCE).
