FAST 54102 Big Mouth Billet 102mm Throttle Body GM LS L92/LS3/LS7 w/o TPS/IAC

Vehicle Fitment

• Universal fit - compatible with any GM LS-series engine equipped with a 102mm 4-bolt throttle body flange intake manifold
• Primary application: FAST LSXR and LSXRT 102mm intake manifolds on L92, LS3, and LS7 engines
• Also compatible with other aftermarket 102mm 4-bolt LS intake manifolds sharing the GM LS stock flange bolt pattern

Fitment Notes

• Does NOT include TPS (Throttle Position Sensor) or IAC (Idle Air Control) motor - see FAST part 54103 for the version that includes TPS and IAC
• Cable-driven throttle actuation only - not compatible with drive-by-wire (electronic throttle control) applications
• Uses GM LS stock 4-bolt flange pattern - verify intake manifold opening is 102mm before ordering
• Not a direct bolt-on replacement for stock factory LS throttle bodies without a 102mm intake manifold
• Sold individually - one throttle body per listing; gaskets not included

Features

• 102mm bore diameter delivers maximum airflow for high-horsepower LS builds on L92, LS3, and LS7 platforms
• Increased throttle blade thickness eliminates blade deflection under high boost and wide-open-throttle conditions
• Offset blade pivot design provides smoother throttle response and reduced turbulence, especially at partial throttle
• Dual throttle return spring mechanism provides positive spring tension for safety and consistent pedal feel
• Progressive throttle pulley improves low-throttle drivability for street and daily-driven builds
• Billet aluminum construction with clear anodized finish for corrosion resistance and clean appearance
• 4-bolt GM LS stock flange - bolts directly to FAST LSXR, LSXRT, and other 102mm LS intake manifolds

Specifications

• Part Number: 54102
• Series: Big Mouth LT
• Bore Diameter: 102mm
• Throttle Body Style: Single blade, multi-port injection (MPI)
• Material: Billet Aluminum
• Finish: Clear Anodized
• Actuation: Cable-driven
• Flange: 4-bolt GM LS stock pattern
• Blade Quantity: 1
• TPS Included: No
• IAC Motor Included: No
• Gaskets Included: No
• UPC: 036584207412

Included Components

• 1x FAST Big Mouth 102mm Billet Throttle Body (clear anodized)

Product Description

The FAST 54102 Big Mouth 102mm Billet Throttle Body is engineered specifically for GM LS-series engines running FAST LSXR or LSXRT 102mm intake manifolds, or any other aftermarket LS intake with a 102mm 4-bolt opening. At 102mm bore diameter, this throttle body is purpose-built for high-horsepower L92, LS3, and LS7 applications where maximum airflow is essential. The billet aluminum body features a thicker throttle blade to prevent deflection under boost or at wide-open throttle, while the offset pivot design and progressive throttle pulley deliver smooth, precise throttle response from idle to redline.

This is a cable-driven throttle body and is not compatible with drive-by-wire setups. It does not include a TPS sensor or IAC motor - builders retaining their existing sensors should source them separately, or select FAST part number 54103 which includes both. Gaskets are not included. For builds targeting peak LS performance with a FAST LSXR or equivalent 102mm intake manifold, the 54102 is the matched throttle body designed and validated by FAST for that application.