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 Rocker Arm, Ultra Pro Magnum, Full Roller, Chromoly Steel, 1.7 Ratio, For Chevrolet 348-409 3/8 in. Stud, Set of 16

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