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Our Stud Girdles are engineered for high pressure springs, high lift cams or turning big rpm. They support and strengthen your rocker studs keeping valvetrain deflection to a minimum which could cause lost horsepower or even worse, component failure. They also provide fewer valve-lash adjustment sessions. Machined from billet aluminum for maximun strength and anodized in a clear finish. Includes adjusting nuts. For use with .600'' slot rocker arms. Made in the USA.