Holley 4BBL To SBC TBI Front Mount

The TRANS-DAPT Holley 4-Barrel to SBC TBI Front Mount adapter (model 2202) is a precision-engineered throttle body adapter designed to enable direct installation of modern SBC TBI (Throttle Body Injection) systems onto classic square-bore intake manifolds originally designed for Holley carburetors. This 1/4-inch thick steel adapter bridges the dimensional and bolt-pattern gap between two distinct fuel delivery eras, allowing engine builders to retrofit electronic fuel injection into carbureted Small Block Chevrolet platforms without requiring extensive intake manifold modification.

Manufactured from steel and supplied with gasket and hardware, the adapter maintains a compact footprint at 7.25 × 1.55 × 8.75 inches with a net weight of 2.58 pounds. The front-mount design positions the TBI throttle body in the factory-correct forward orientation, preserving proper linkage geometry and vacuum line routing. The pre-drilled pattern accommodates standard SBC TBI fasteners while the Holley-pattern mounting surface ensures alignment with existing intake bolt holes. Precision machining of the sealing surfaces minimizes risk of vacuum leaks or fuel system disruption—critical for tuning stability in carbureted-to-injected conversions.

This adapter is essential for classic car restorers, hot rod builders, and engine swap specialists converting older Small Block Chevrolet platforms to modern fuel injection. Street and strip builders benefit from the drivability, cold-start performance, and fuel economy gains that TBI systems deliver over carburetor setups. The adapter eliminates the need for expensive custom intake manifolds or port-matching work, making electronic fuel injection retrofit accessible for standard square-bore installations. Installation requires basic mechanical skill and proper gasket selection to ensure a clean seal.