Granatelli GM LS3 6.2L Drive-By-Wire Billet Throttle Body – GMTBLS108B

Granatelli Motor Sports GM LS3 6.2L Drive-By-Wire Billet Throttle Body GMTBLS108B

Built for Performance, Fitment, and Dependable Operation

Part Number: GMTBLS108B

The Granatelli Motor Sports GM LS3 6.2L Drive-By-Wire Billet Throttle Body GMTBLS108B is engineered as a performance-focused Granatelli Motor Sports component for enthusiasts, professional installers, and custom builders. The design emphasizes dependable operation, practical installation, and compatibility with the intended application.

LS3 108mm Throttle Body – 108mm RACE Drive-By-Wire

The Granatelli 108mm RACE Throttle Body is an LS3 108mm throttle body precision-machined from 6061-T6 billet aluminum and finished in black. It is engineered for both naturally aspirated and forced-induction LS3, LSA and LSX applications that have outgrown a 102mm or 103mm throttle body.

• 108mm round bore: significantly outflows OEM units
• Adapter included: comes with an adapter, same as the natural-finish GMTBLS108
• Boost-ready: electronic motor rated for up to 35 lbs of boost
• Drive-by-wire: complete electronic throttle body assembly
• TUNE REQUIRED. Trailblazer SS owners must call before ordering for proper calibration.

Key Features & Benefits

• Application-focused Granatelli Motor Sports design
• Built for performance and replacement use where applicable
• Designed for dependable installation and long-term service
• Suitable for enthusiasts, professional installers, and custom builds

Fitment & Installation

Confirm the part number, vehicle or engine application, dimensions, and supporting components before installation. Modified vehicles may require additional clearance, fabrication, calibration, or related hardware depending on the combination.

108mm vs. 103mm LS3 Throttle Body

For a stock-style or mildly boosted LS3 intake, the 103mm GMTBLS3 billet LS3 throttle body is the usual answer. Step up to the 108mm GMTBLS108B when your intake manifold opening and inlet tract can use the extra area, typically on high-output naturally aspirated or supercharged and turbocharged combinations. Prefer a natural finish? See the GMTBLS108. Compare every size in our throttle body size guide.

Installation Notes

• Verify your intake manifold opening, bolt pattern, GM 6-pin drive-by-wire connector and clearance before ordering.
• The adapter that comes with the throttle body is included in the box.
• A larger inlet may need a different intake tube or coupler.
• A tune is required after installation.

Frequently Asked Questions

What is this Granatelli Motor Sports part designed for?
It is designed for the application and function shown in the product title and specifications. Confirm your exact vehicle, engine, dimensions, and supporting components before ordering.

Is this suitable for a performance build?
Yes, where the listed application matches the build. Final compatibility and results depend on the complete vehicle combination and installation.

Which engines does the 108mm LS3 throttle body fit?
It is listed for GM LS3, LSA and LSX applications using the GM 6-pin drive-by-wire setup. Product images also show it on the Chevrolet Silverado 1500 6.2L V8 and the Workhorse W62 custom chassis 6.0L V8. Confirm your manifold opening before ordering.

Is the bore round or oval?
Round. The GMTBLS108B has a round 108mm bore.

Does it come with an adapter?
Yes. An adapter is included, the same as with the natural-finish GMTBLS108.

How much boost can it handle?
The electronic motor is rated for up to 35 lbs of boost.

Do I need a tune?
Yes. GM throttle body upgrades require a tune.

Why Choose Granatelli Motor Sports?

Granatelli Motor Sports develops performance components for real-world street, street/strip, race, and custom applications. Each product is designed around practical performance, dependable construction, and integration into serious automotive builds.

Made in the USA in Oxnard, California. Orders placed before 3:30 PM Pacific ship the same day, and shipping is free on orders over $100. 90-day warranty, with extended coverage available.