2 To 4bbl Carb Adapter

The MOROSO 2 to 4 Barrel Carburetor Adapter (Part No. 64966) is a precision aluminum intake manifold adapter engineered to bridge 2-barrel Holley carburetors to square-bore mounting pads. This adapter solves a critical compatibility challenge: matching a smaller displacement or vintage 2-barrel fuel delivery system to modern square-bore blocks without sacrificing intake seal integrity or airflow efficiency. The 0.75-inch thick aluminum construction and 1-11/16-inch bore diameter are sized to preserve velocity and atomization across the transition zone, making this adapter a go-to solution for budget-conscious engine builders and vintage hot rod enthusiasts.

The adapter features a 2-hole fastening pattern that indexes directly to Holley 2-barrel flanges while accommodating square-bore bolt patterns on the engine block side. Natural aluminum finish provides corrosion resistance suitable for both street and competition applications. At 2.16 pounds and measuring 6.9 x 1.55 x 6.95 inches, this adapter fits within tight underhood packaging constraints without requiring custom manifold modifications. The precision-cast construction ensures consistent gasket sealing surfaces—critical to preventing vacuum leaks that would destabilize fuel mapping and idle quality.

This adapter is ideal for engine swaps, carbureted restorations, and fuel delivery system downgrades where weight savings or simplicity outweigh multi-barrel complexity. Owners working with small-block platforms or street-legal vintage builds rely on MOROSO adapters to maintain OEM bolt patterns while accommodating smaller carburetors. The straightforward 2-hole design eliminates guesswork: verify your block's square-bore pattern and carburetor flange type before installation to ensure proper alignment and gasket compression.