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These Ultra-Gold™ Aluminum Break-In Rocker Arms from COMP Cams® are designed with a lower-than-stock ratio to help break in new Chevrolet V8 Small Block applications. Engineered with a 7/16" stud diameter and 1.3 ratio, these Ultra-Gold™ Aluminum Break-In Rocker Arms eliminate the excess open spring pressure, making them the new �Gold Standard� for the break-in process.