Gen 3 Marine Ultra Dominator Carburetor 1050 CFM 4500 Mechanical Secondaries Hard Core Gray Gasoline HolleyThe patent pending Gen 3 main body is 5 16 inch taller than the previous generation! This new height allowed for larger radius air entries which were optimized using Computational Fluid Dynamics (Cfd) software to deliver smoother flow into new fully machined, big bore venturii. The main body also features an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship as well