Proper push rod length is absolutely critical for peak performance - minimizing bent or broken valve stems, guide wear, and energy-wasting valve side-loading friction. Fits all 1955-1986 Chevrolet Models. Product Features:Mock-Up Rocker Arm onlyFits 3/8-in. Studs for Small Block Chevy EnginesMade from High-Quality Molded PlasticBlue Finish1-inch Stud Length
