Engine swaps are a popular way to enhance performance, replace a worn-out engine, or upgrade to newer technology in GMC vehicles.
Many GMC engines are shared across multiple General Motors platforms, which makes swaps easier.
GMC Engine Swap Compatibility Chart
| Engine Family | Engine Code | Displacement | Years Produced | Compatible GMC Models | Other GM Vehicles Using Same Engine | Swap Difficulty |
|---|---|---|---|---|---|---|
| Small Block V8 Gen I | 305 | 5.0L | 1987–1999 | Sierra, Suburban, Jimmy | Chevrolet C/K trucks, Camaro | Easy |
| Small Block V8 Gen I | 350 (L31) | 5.7L | 1996–2002 | Sierra, Yukon, Savana | Chevrolet Silverado, Tahoe, Suburban | Easy |
| Small Block V8 Gen I | 400 | 6.6L | 1970–1980 | C/K trucks | Chevrolet C/K trucks | Easy |
| V6 Vortec | 4300 (L35) | 4.3L | 1996–2014 | Sonoma, Sierra 1500, Safari | Chevrolet S10, Blazer, Silverado | Easy |
| V6 Vortec | L35 | 4.3L | 1996–2005 | Sierra 1500, Jimmy | Chevrolet S10, Blazer | Easy |
| LS Series V8 | LR4 | 4.8L | 1999–2007 | Sierra 1500, Yukon | Silverado, Tahoe, Suburban | Easy |
| LS Series V8 | LM7 | 5.3L | 1999–2007 | Sierra 1500, Yukon, Yukon XL | Silverado, Tahoe, Avalanche | Easy |
| LS Series V8 | L59 | 5.3L Flex Fuel | 2002–2007 | Sierra, Yukon | Silverado, Suburban | Moderate |
| LS Series V8 | LQ4 | 6.0L | 1999–2007 | Sierra 2500, Savana | Silverado HD, Express | Moderate |
| LS Series V8 | LQ9 | 6.0L High Output | 2002–2007 | Yukon Denali | Cadillac Escalade | Moderate |
| LS Series V8 | LY5 | 5.3L | 2007–2013 | Sierra 1500, Yukon | Silverado, Tahoe | Moderate |
| LS Series V8 | LMG | 5.3L Flex Fuel | 2007–2014 | Yukon, Sierra | Tahoe, Avalanche | Moderate |
| LS Series V8 | L94 | 6.2L | 2010–2014 | Yukon Denali | Escalade, Silverado | Moderate |
| EcoTec V6 | LLT | 3.6L | 2010–2017 | Terrain | Chevrolet Equinox, Cadillac SRX | Moderate |
| EcoTec I4 | LE5 | 2.4L | 2006–2012 | Terrain | Chevrolet Malibu, Pontiac G6 | Moderate |
| Gen V LT V8 | L83 | 5.3L | 2014–2020 | Sierra 1500, Yukon | Silverado, Tahoe | Hard |
| Gen V LT V8 | L86 | 6.2L | 2014–2020 | Yukon Denali, Sierra | Cadillac Escalade | Hard |
| Gen V LT V8 | LT1 | 6.2L | 2014–2019 | Sierra 1500, Yukon | Camaro, Corvette | Hard |
| Gen V LT V8 | LT4 | 6.2L Supercharged | 2015–2019 | Sierra Denali | Corvette, Camaro Z06 | Hard |
| Duramax Diesel | LB7 | 6.6L | 2001–2004 | Sierra 2500HD, 3500HD | Silverado HD | Hard |
| Duramax Diesel | LLY | 6.6L | 2004–2006 | Sierra HD | Silverado HD | Hard |
| Duramax Diesel | LBZ | 6.6L | 2006–2007 | Sierra HD | Silverado HD | Hard |
| Duramax Diesel | LMM | 6.6L | 2007–2010 | Sierra HD | Silverado HD | Hard |
| Duramax Diesel | LML | 6.6L | 2011–2016 | Sierra HD | Silverado HD | Hard |
| Duramax Diesel | LM2 | 3.0L Inline‑6 | 2020–Present | Sierra 1500, Yukon | Silverado, Tahoe | Hard |
| Vortec V8 | 5700 | 5.7L | 1996–2007 | Sierra, Yukon | Chevrolet Silverado, Tahoe | Moderate |
| Vortec V8 | 6000 | 6.0L | 2000–2007 | Sierra 2500HD, Savana | Silverado HD, Express | Moderate |
| Vortec V8 | 6200 | 6.2L | 2007–2014 | Yukon Denali, Sierra HD | Escalade, Silverado | Moderate |
| Iron Duke I4 | LQ1 | 2.5L | 1980–1993 | Sonoma, S15, Jimmy | Chevrolet S10 | Easy |
| High Output V8 | LT5 | 5.7L DOHC | 1990–1995 | Performance GMC builds | Corvette ZR-1 | Hard |
Understanding Swap Difficulty
- Easy – Minimal modifications, bolt-in compatible, shared mounts and transmission.
- Moderate – Requires some modifications, such as custom mounts, wiring harness adjustments, or ECU tuning.
- Hard – Extensive modifications needed, including wiring, fuel system, transmission, and electronics integration. Often involves engines from different generations or high-performance engines.
Related Chevy Engine Swap Compatibility Chart(For All Engine Types)
Common GMC Engine Swap Platforms
LS Engine Swaps
The LS engine family is the most popular choice for GMC engine swaps. These engines provide excellent performance, reliability, and aftermarket support. Popular LS engines include:
- 5.3L LM7
- 4.8L LR4
- 6.0L LQ4
- 6.2L L86
LS engines are compatible across many GMC trucks and SUVs, making installation easier with minimal modifications.
Vortec Engine Swaps
Older GMC trucks commonly use Vortec engines. These engines are often direct replacements within the same generation. Common swaps include:
- 4.3L V6 in Sonoma and S-series trucks
- 5.7L V8 in older Sierra models
Duramax Diesel Swaps
Duramax engines are common in heavy-duty GMC trucks. Swaps often require ECU updates, wiring harness changes, and upgraded cooling systems. Popular swaps include:
- LB7 → LLY → LBZ → LML
Related GMC Engine Oil Capacity Chart(For All Models)
GMC Models With the Most Swap Options
GMC Sierra
The Sierra pickup shares many components with Chevrolet Silverado trucks, making engine swaps easier. LS, Vortec, and Duramax engines are widely compatible.
GMC Yukon
The Yukon SUV shares engines with the Chevrolet Tahoe, Suburban, and Cadillac Escalade, providing multiple engine swap options.
GMC Savana
The Savana van supports a wide range of V6, V8, and diesel engines used across GM trucks and vans.
Related GM Engine Code Reference Chart(For All Engine Codes + Years)
Factors to Consider Before an Engine Swap
1. Engine mounts – Check if adapters or modifications are needed.
2. Transmission compatibility – Confirm bellhousing pattern and torque converter fit.
3. Wiring and ECU – Modern engines often require a new wiring harness or ECU programming.
4. Fuel system – Some engines may need upgraded fuel pumps, lines, or injectors.
5. Emissions compliance – Ensure the swap meets local regulations.
Related 2013 GMC Acadia Engine Oil Capacity(+ Best Recommended Oils)
Final words
GMC engine swaps are an effective way to improve performance, replace old engines, or upgrade to modern technology. With engines shared across multiple GM platforms, a variety of swaps are possible, from classic small block V8s to modern LS engines and Duramax diesels.
By using a compatibility chart and understanding the factors that affect installation, vehicle owners can plan swaps efficiently, avoid problems, and achieve the best results for their GMC trucks, SUVs, or vans.
