Mercury also added a new model to the Cyclone line: the Cobra Jet (CJ). The Cobra Jet's engine was a which generated . The engine had a Ram Air option, a 735 CFM Holley four-barrel carburetor although the option showed no quoted difference in horsepower rating. The Mercury Cyclone CJ had the following enhancements over the Cyclone and Cyclone GT: it had a blacked-out grille; dual exhausts; 3:50:1 axle ratio; engine dress-up kit (chromed parts); hood (bonnet) stripes; and a competition handling package.