Some engine models will require a closed cooling kit, a belt kit, and a seawater pump kit. Other models will not require all these kits. A note indicates that there might be a different kit that is required to make the kits fit the engine on which the closed cooling is being installed. Front mounted kit 860427A4 Fits MerCruiser Marine V-6 & V-8 (350 cubic inch displacement) engines with serpentine belt.