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: Increases intake plenum volume and optimizes air charge velocity directly beneath the factory throttle body injection (TBI) unit to sharpen throttle tip-in and recover off-idle torque.

The Stock C/K Intake Plenum Bottleneck

The factory TBI intake manifold on GMT400 platform trucks features an abrupt transition directly below the dual-bore throttle unit. This tight clearance induces boundary-layer turbulence and uneven fuel atomization before the charge enters the intake runners, dampening throttle response and choking off low-RPM torque when operating under towing or heavy payload conditions.

The Engineering Solution

Precision CNC-machined from 6061-T6 billet aluminum, this spacer adds effective plenum volume to stabilize incoming air charges. The specialized internal bore design accelerates airflow to enhance fuel-air mixing without disturbing critical manifold vacuum or factory sensors. Finished with a corrosion-resistant anodized coating, it withstands engine bay thermal cycling while preventing vacuum leaks under sustained manifold vacuum.

Technical Specifications

Compatibility

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

The GMC Workhorse Caliber

Engineered to handle severe towing loads and off-road work, this mechanical upgrade delivers crisp throttle pickup and reliable low-end pulling force without requiring computer recalibration or electrical tuning.