MSD Pro-Cap - Fits MSD Pro Mag Only Underwear Top This product is designed to

This product is designed to use as a carburetor spacer

While other gauges have 14 or more moving parts

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3/16 in Bore

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MSD Pro-Cap - Fits MSD Pro Mag Only Underwear Top This product is designed toTo go with the huge power of the Pro Mag 44, MSD developed a huge cap and rotor, the Pro Cap! The Cap has a big 5" terminal to terminal diameter which ensures spark delivery and prevents the chance of spark scatter occurring inside the cap. The entire assembly is injection molded from Dupont(R) Rynite? material for incredible strength and high dielectric properties. The Rotor features a deep skirt and thick vanes to stir up the air and even the rotor