For marine applications, these Edelbrock marine series carbs comply with safety standards set by the U.S. Coast Guard. The surfaces that are cast are then iridized, with PTFE-coated shafts and pump arm to provide maximum protection. Modified bowl venting, specially designed throttle shafts, accelerator pump seal, 3/8" inverted flare fuel inlet fitting, tube in air horn for fuel pump vent, 5-1/8" flame arrestor flange, universal throttle lever and revised secondaries for improved transient performance are added features. Note: These carbs are designed without vacuum ports and are therefore not fit for automotive use.