Designed and calibrated from Edelbrock for use in marine applications, these Edelbrock carbs comply with U.S. Coast Guard safety standards. Cast surfaces are protected by a Chromate conversion coating which is used as a corrosion inhibitor. Other features include modified bowl venting, specially designed throttle shafts, an accelerator pump seal, a 3/8 in. inverted flare fuel inlet fitting, tube in airhorn for fuel pump vent, a 5 1/8 in. flame arrestor flange, a universal throttle lever, and revised secondaries for improved transient performance. Also included with every Edelbrock carburetor are instructions for installation, set up, and basic tuning.