Looking to upgrade your LS engine with a Nick Williams throttle body for better airflow and throttle response? This guide highlights five top Nick Williams throttle bodies that fit Gen III/IV LS, Gen V LT, and related LS-based setups. It helps you pick the right model for your setup—whether you’re running a naturally aspirated, turbocharged, or supercharged induction system. The summary below compares compatibility, bore size, drive-by-wire versus cable, and mounting considerations to match your goals and intake configuration.
Summary of Top Picks
| Product | Engine Fitment | Bore Size | Drive Type | Best For |
|---|---|---|---|---|
| Nick Williams SD103BK 103mm Black Billet Drive-by-Wire | Gen III/IV LS (4.8–6.2L) | 103mm | Drive-by-Wire | High-flow setups with modern wiring and six-pin control |
| Nick Williams SD103LTX 103mm DBW Throttle Body | Gen V LT1/LT4 and LT engines | 103mm | Drive-by-Wire | Gen V LT applications needing a larger opening |
| Nick Williams SD103LTXB 103mm Black DBW Throttle Body | 2014+ Gen V LT V8 | 103mm | Drive-by-Wire | Complete assembly with electronics; ready to install |
| Nick Williams 103mm LS DBW Throttle Body | Gen III/IV LS family | 103mm | Drive-by-Wire | Direct upgrade for maximum airflow on LS builds |
| Nick Williams 102MM LS Gen 3/4 Cable Throttle | Gen III/IV LS (4.8–6.2L) | 102mm | Cable | Retrofit or older swaps requiring cable operation |
Nick Williams SD103BK 103mm Black DBW Throttle Body
The SD103BK uses a large 103mm bore to support increased airflow for modified LS engines. It is CNC machined from billet aluminum and finished in black for a clean appearance in exposed intake systems. It features a six-pin drive-by-wire design for modern ECU compatibility. Best for high-flow naturally aspirated, turbocharged, or supercharged builds in Gen III/IV LS swaps. Caution: confirm the six-pin connector matches your wiring harness before ordering to avoid compatibility issues.
Nick Williams SD103LTX 103mm DBW Throttle Body
Designed for Gen V LT engines, the SD103LTX provides a 103mm bore and complete drive-by-wire assembly with a four-bolt mounting pattern. It’s CNC machined from billet aluminum with a natural finish and is tailored for LT1/LT4/L83/L86/L8B platforms. Best for modern LT-based builds needing large airflow with a ready-to-install package. Limitation: aftermarket intake compatibility is essential; the large blade requires a suitable manifold or adapter pattern.
Nick Williams SD103LTXB 103mm Black DBW Throttle Body
The SD103LTXB is a complete drive-by-wire assembly built for 2014+ Gen V LT engines. It arrives fully assembled with the throttle blade and electronics installed, simplifying installation. Best for LT-powered builds that demand straightforward retrofitting with six-pin Gen V connectors. Consideration: verify application coverage for your specific LT configuration, as some late-model vehicles may require adapter considerations.
Nick Williams 103mm LS DBW Throttle Body CNC Billet
This 103mm LS DBW throttle body is CNC machined for maximum airflow and throttle response on Gen III/IV LS engines. It fits LS1/LS2/LS3/LQ4/LQ9/L92/L94/L76/L77LY6/L96 combinations in 4.8–6.2L configurations. Best for high-horsepower LS builds seeking a direct 103mm upgrade with drive-by-wire control. Limitation: ensure your intake manifold pattern matches the throttle body’s mounting pattern for a proper seal and fit.
Nick Williams 92MM LS Gen 3/4 Cable Throttle
The 92MM cable-operated option provides compatibility with older LS swaps and aftermarket intakes that rely on a traditional throttle cable. It uses the GM throttle position sensor and idle air control motor. Best for retrofits or builds where a cable-throttle design is required. Caution: not suitable for drive-by-wire ECU systems without additional conversion hardware.
Nick Williams 102MM LS Gen 3/4 Cable Throttle
The 102MM cable throttle body is a CNC billet unit designed for LS applications with a cable drive. It fits Gen III/IV engines and is ideal for retrofits or swaps into vehicles that prefer cable operation. Best for older swaps where electronic throttle control is not available or desired. Limitation: requires a compatible 102mm aftermarket intake and proper cable linkage setup.
Buying Guide: How To Choose The Right Nick Williams Throttle Body
- Drive-by-Wire vs Cable: If your engine management expects electronic throttle control, choose a DBW model (SD103BK, SD103LTX, SD103LTXB, or LS DBW variant). If you need a traditional cable system, consider the 92MM or 102MM cable products.
- Bore Size And Airflow Needs: A 103mm bore suits modified LS engines with higher airflow needs, including turbocharged or supercharged builds. A 92mm or 102mm bore may fit older swaps or smaller naturally aspirated builds.
- Gen III/IV LS vs Gen V LT: Gen V LT applications (LT1/LT4) typically require Gen V-compatible vendors and connectors. Gen III/IV LS setups can use traditional LS-specific throttle bodies with cable or drive-by-wire configurations.
- Mounting And Wiring: Check mounting bolt patterns (four-bolt vs other patterns) and the wiring connector type. Some products include mounting bolts and electronics pre-installed, which speeds up installation.
- Intake Compatibility: A larger bore often necessitates an aftermarket intake or adapter. Verify that your intake manifold pattern aligns with the throttle body’s bore and mounting configuration.
- Installation Complexity: Fully assembled DBW units reduce installation complexity, while cable options may require linking rods, TPS, and IAC integration. Plan for any adapter hardware that may be needed.
Frequently Asked Questions
- What is drive-by-wire? Drive-by-wire uses electronic signals and a throttle control motor instead of a mechanical cable. It requires compatible ECU wiring and connectors.
- Will a 103mm throttle body fit my stock intake? A 103mm opening often requires an aftermarket intake or adapter to match the bore and mounting pattern. Verify your intake pattern before purchase.
- Is a larger bore always better? Not always. A larger bore increases airflow, but it must be matched to the engine, intake design, and ECU calibration to avoid spooling or throttle response issues.
- Do I need special installation hardware? Some models include mounting bolts and electronics; others may require additional adapters or hardware for proper fitment. Check product details and vehicle compatibility.
- Can I swap between drive-by-wire and cable systems? No, these are not directly interchangeable. A vehicle designed for DBW requires DBW hardware and wiring; a cable system requires a mechanical linkage setup.
- Which product is best for a Gen V LT engine? For Gen V LT applications, the SD103LTX or SD103LTXB are designed for LT1/LT4 families, offering a 103mm bore and six-pin connectors tailored to Gen V wiring.