Throttle Body Spacer for GMC C/K Trucks (1988-1995) 4.3L 5.0L 5.7L

Billet Aluminum Throttle Body Spacer for 1988-1995 GMC C/K Trucks

What it Does: The CNC-machined throttle body spacer increases intake plenum volume and smooths incoming air velocity on 1988-1995 GMC C/K Trucks to sharpen throttle response and improve low-end torque.

The Stock GMC C/K Trucks Intake Plenum Inefficiency

On factory GMT400 platform trucks, the factory Throttle Body Injection (TBI) assembly bolts flush against the cast-iron intake manifold floor with minimal standoff distance. This compact packaging creates an abrupt transition directly below the butterfly valves. The resulting shear angle induces air turbulence, uneven air-fuel atomization between front and rear runners, and sluggish throttle response off idle, which hampers low-RPM pulling power under heavy loads.

The Engineering Solution

Precision CNC-machined from solid 6061-T6 billet aluminum, this spacer establishes a critical buffer between the throttle body base and the intake runners. By increasing plenum volume, it optimizes air charge velocity and allows fuel droplets from the central injectors to mix more thoroughly before entering the cylinders. The continuous bore profile eliminates restrictive shelf edges, reducing pumping losses without altering vacuum signals. An anodized surface finish protects against heat soak, fuel wash, and corrosive crankcase vapors. It installs directly using factory mounting points with no ECU tuning required.

Technical Specifications

Compatibility

• 1988-1995 GMC C1500 / K1500 (4.3L V6 LB4, 5.0L V8 L03, 5.7L V8 L05)
• 1988-1995 GMC C2500 / K2500 (5.0L V8 L03, 5.7L V8 L05)
• 1988-1995 GMC C3500 / K3500 (5.7L V8 L05)

Frequently Asked Questions

Does this fit the GMT400 C/K Trucks?
Yes, this is a direct fit for the 1988-1995 GMC C/K Trucks equipped with the LB4, L03, or L05 TBI engines.

Is an ECU tune required after installation?
No, this mechanical spacer operates within factory air-fuel trim boundaries and requires no software recalibration or chip tuning.

The GMC Workhorse Standard

Built for the severe demands of towing, trailering, and payload duty, this billet spacer provides the structural integrity and airflow stability needed to keep your GMT400 performing under demanding truck workloads.