All Holley Marine Carburetors are designed to meet Coast Guard specifications. A marine Carburetors fuel metering system is calibrated to compensate for unique engine loads found on boats. The J-style vent tubes direct spilt fuel/fumes back into the carburetor for safe operation while on rough waters. Product Features:Gold Dichromate Finish For Corrosion Resistance w/Classic LookPerformance Marine CalibrationManual Choke For Precise Cold Start ControlMechanical Secondaries For Awesome PerformanceDual Feed Fuel Inlets For Constant High Volume Fuel Delivery4 Corner Idle Allows You To Precisely Control Your Idle SystemJ-Style Vent TubesMeets Coast Guard SpecificationsPower Valve Blow-Out Protection100% Wet-Flow Tested To Assure It Arrives Ready To Run
