Full System - Front Mounts on 7.4L/454 CID V8 GM MerCruiser, carbureted or throttle body fuel injected engines w/ center discharge exhaust, AND V-BELTS. This kit works on Bravo Drive or straight inboard applications. WILL NOT FIT V-DRIVE APPLICATIONS. If engine is a Magnum, additonal required MC330MAGKIT must be ordered ($20). Cools and protects both the engine block and exhaust manifolds. If engine is equipped with 3" or 6" spacer blocks between exhaust manifolds and riser, the appropriate ADDITIONAL Mercruiser Riser Extension Kit must be ordered. Kit comes complete with detailed installation instructions.