These COMP Cams rocker arm shaft spacers are designed to allow the engine to rev higher and reduce the possibility of parts breakage. They are used on engines with adjustable rocker arms to improve valve tip alignment.

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COMP Cams Ultra Pro Magnum Rocker Arm Shaft 1621 For Chrysler 383-440 B/RB Shaft Kit

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COMP Cams Rocker Arm, High Energy Nitrided, 1.5 Ratio For Chevrolet Small Block w/ 7/16 in. Stud, Set of 16

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COMP Cams Rocker Arm, Ultra Pro Magnum, Full Roller, Chromoly Steel, 1.5 Ratio, Shaft Mount For Chrysler 383-440 B/RB, Set of 16

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COMP Cams Rocker Arm, Ultra Pro Magnum XD, 1.73 Ratio, For Chevrolet Big Block w/ 7/16 in. Stud, Full Roller, Steel, Set of 16

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COMP Cams Rocker Arms, Shaft Mount, Steel, 1.8 Ratio, For Chevrolet, LS, Kit

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COMP Cams Rocker Arm, Ultra Pro Magnum, Full Roller, Chromoly Steel, Self-Aligning 1.6 Ratio, For Ford 3/8 in. Stud, Set of 16

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