The easy-to-use, custom design of the new COMP Cams® Small Block Chevy Valve Spring Compressor enables the effortless removal and installation of valve springs, without the hassle of first having to remove any of the other installed rocker arms. The tool fits 3/8" and 7/16" rocker arm studs, and it works on all Small Block Chevy engines, with cylinder heads either on or off. The tool's compact design facilitates easy usage in vehicles where other tools are incapable of reaching the tight spaces, and it is small enough to fit in any toolbox. Featuring a durable steel design, the Small Block Chevy Valve Spring Compressor Tool comes with a lifetime guarantee against failure. This affordable valve spring compressor tool works on two springs at a time and is a must have for all SBC engine builders and enthusiasts.