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COMP Cams Thumpr LS Master Camshaft Packages The outstanding sound of COMP Cams® Thumpr™ Cams is now available for your LS engine! COMP Cams Thumpr LS Master Camshaft Packages come as a complete valve train parts package that is matched for specific LS applications and desired performance. COMP Cams® engineers have spent countless hours testing and creating valve train component combinations that are perfectly matched for maximum HP and dependability, as well as creating that wildly popular Thumpr™ sound in GM LS applications. These Thumpr™ Camshaft Packages can add anywhere from 60 to 110 HP (depending on the application).