Marine Carburetor Aluminum 500 CFM 2300 Hard Core Gray Gasoline HolleyAll 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 fuel fumes back into the carburetor for safe operation while on rough waters. The aluminum Holley 0 80402 2 Marine carburetor is designed with a universal calibration good for small cubic inch marine engines where a 2300 model 2BBL with