99- GM P/U 4.8 5.3 6.0 TBI Spacer

The 99- GM P/U 4.8 5.3 6.0 TBI Spacer from Trans-Dapt is a precision intake manifold spacer engineered for 1999 and newer GM pickup trucks equipped with throttle body injection systems. Built for serious truck builders and performance enthusiasts, this spacer sits between the intake manifold and carburetor or throttle body assembly to optimize fuel distribution, improve air velocity, and enhance combustion efficiency across the engine bay.

This spacer works by creating a precisely calibrated plenum volume that promotes even fuel atomization and reduces fuel pooling in the intake runners—a critical concern on carbureted and TBI applications where manifold vacuum signal can vary. The design accommodates all three displacement variants (4.8L, 5.3L, and 6.0L) common to GMT800 and newer platforms, with machined surfaces ensuring proper gasket sealing and zero vacuum leaks. Constructed from quality aluminum, the spacer weighs just 1.29 pounds and maintains OEM gasket port dimensions for bolt-and-go installation without modifications.

Truck owners restoring carbureted builds, retrofitting older fuel systems, or tuning TBI setups will see noticeable improvements in throttle response, cold-start behavior, and part-throttle drivability. This is particularly valuable for trucks running marine applications, vintage-style street builds, or any platform transitioning away from modern fuel injection. Installation requires standard hand tools and takes under 30 minutes; gaskets and fasteners should be replaced during fitment to ensure long-term reliability and leak-free operation across all three engine sizes.