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They incorporate a 2 piece design that's .50" shorter than stock for easier removal and installation. Cometic Rocker Box gasket kit and chrome hardware included. Available in satin, polished, powder coat, or chrome finish. Made in the USA.These rocker boxes already have the breather channel modification for use on all Pro Twin "Pro Stock" heads.
Note: The use of these Billet rocker boxes will significantly reduce all valve train noise. These boxes are Billet and are far more dense than a cast version thus significant noise absorption is an added benefit
