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Unlock True Drive-By-Wire Power on Your LT1 or LT4 Engine
The Granatelli Motorsports GMTBLTSPC adapter plate lets you bolt a Granatelli 103mm drive-by-wire throttle body straight onto a stock LT1 or LT4 intake manifold, no porting required. Machined to precisely match the factory LT1/LT4 throttle body bore and bolt pattern, the GMTBLTSPC bridges the gap between the larger 103mm throttle body opening and the factory intake opening so airflow stays clean and the factory drive-by-wire wiring harness plugs in without modification. It is the missing link for anyone stepping up from the factory throttle body to a larger Granatelli unit on a Corvette, Camaro, CTS-V, or CT5-V Blackwing running an LT1 or LT4.
Key Features
- Purpose-built spacer plate for LT1 and LT4 Gen V small block engines
- Allows a Granatelli 103mm drive-by-wire throttle body to mount to the stock LT1/LT4 intake
- No porting or intake modification required for installation
- Precision-machined aluminum construction for a flush, air-tight seal
- Retains factory drive-by-wire electronic throttle control operation
- Includes all hardware needed for a direct bolt-on installation
Fitment Table
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2014-2019 | Chevrolet | Corvette | Stingray |
| 2017-2019 | Chevrolet | Corvette | Grand Sport |
| 2015-2019 | Chevrolet | Corvette | Z06 |
| 2016-2024 | Chevrolet | Camaro | SS |
| 2020-2024 | Chevrolet | Camaro | LT1 |
| 2017-2024 | Chevrolet | Camaro | ZL1 |
| 2016-2019 | Cadillac | CTS | V |
| 2022-2025 | Cadillac | CT5-V | Blackwing |
| 2023-2025 | Cadillac | Escalade | V |
Specifications
| Detail | Value |
|---|---|
| MPN | GMTBLTSPC |
| Engine Compatibility | LT1, LT4 (Gen V Small Block 6.2L) |
| Throttle Body Compatibility | 103mm Drive-By-Wire (e.g. Granatelli GMTBLT4) |
| Width | 4.0 in |
| Height | 1.0 in |
| Length | 4.0 in |
| Weight | 1.0 lbs |
| Material | Aluminum |
| Porting Required | No |
What's Included
- 1x GMTBLTSPC LT1/LT4 throttle body adapter plate
- Mounting hardware
- Gasket/seal as required for installation
About Granatelli Motor Sports
Granatelli Motor Sports has built a reputation on high-performance ignition, throttle body, and intake components engineered for GM, Ford, and Mopar platforms. Every Granatelli throttle body and adapter is machined and flow-tested to deliver a direct bolt-on upgrade path without compromising factory drivability or electronics.
Related Parts
- Granatelli 14-23 GM LT Malevolent Coil Packs - Red (Set of 8)
- Granatelli 14-23 GM LT1 6.2L Hi-Perf Coil-Near-Plug Ignition Wire Connector Kit w/Red Jacket
- Granatelli 14-23 GM LT Direct Ignition Coil Packs - Black (Single)
FAQ
What is the GMTBLTSPC?The GMTBLTSPC is a Granatelli Motorsports adapter plate that allows a 103mm drive-by-wire throttle body to bolt directly onto a stock LT1 or LT4 intake manifold without porting.
Will the GMTBLTSPC work with any 103mm throttle body?The GMTBLTSPC is designed to match Granatelli 103mm drive-by-wire throttle bodies, including the GMTBLT4, on LT1/LT4 applications.
Does installing the GMTBLTSPC require porting the intake manifold?No porting is required. The adapter plate is machined to bridge the factory LT1/LT4 intake opening to the larger 103mm throttle body bore.
Does the GMTBLTSPC retain drive-by-wire functionality?Yes. The factory electronic throttle control and wiring harness continue to operate normally once the adapter and throttle body are installed.
What engines is the GMTBLTSPC designed for?The GMTBLTSPC is designed specifically for the Gen V Small Block LT1 and LT4 6.2L V8 engines used in Corvette, Camaro, CTS-V, CT5-V Blackwing, and Escalade-V applications.
What material is the GMTBLTSPC made from?The adapter plate is machined from aluminum for a precise, air-tight seal between the throttle body and intake manifold.
Does the GMTBLTSPC come with mounting hardware?Yes, all hardware needed to bolt the adapter plate between the throttle body and intake manifold is included.
Can the GMTBLTSPC be installed with common hand tools?Yes, installation is a straightforward bolt-on process that does not require specialty tools beyond a basic socket set.
Install Instructions
- Disconnect the negative battery terminal before beginning installation
- Remove the factory throttle body from the intake manifold
- Clean the intake manifold mounting surface
- Position the GMTBLTSPC adapter plate against the intake manifold using the supplied gasket/seal
- Mount the 103mm drive-by-wire throttle body to the adapter plate
- Torque all mounting hardware to manufacturer specification
- Reconnect the throttle body electrical connector and battery terminal
- Start the vehicle and allow the electronic throttle control to complete its relearn cycle
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