GMC Sierra HD Engines by Year

GMC's heavy-duty Sierra 2500 and 3500 pickups share their engines with the Chevrolet Silverado HD. The half-ton Sierra has its own page. Ratings are the light-duty federal figures; some trucks over 10,000 lb GVWR carried lower ratings, noted where they apply.

Pick a year to see every engine offered that model year, with its code, rated horsepower and the trims it came in. Each engine links to its full specs.

Jump to a year

GMT400 carryover (1999–2000): 1999 · 2000

GMT800 (1999–2007): 1999 · 2000 · 2001 · 2002 · 2003 · 2004 · 2005 · 2006 · 2007

GMT900 (2007–2014): 2007 · 2008 · 2009 · 2010 · 2011 · 2012 · 2013 · 2014

K2XX (2015–2019): 2015 · 2016 · 2017 · 2018 · 2019

T1 (2020–2026): 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026

GMT400 carryover (1999–2000)

The 5.7 and 7.4 V8s and the 6.5 turbodiesel.

1999 Sierra HD engines

Engine	Rated	Offered in
5.3L / 325 V8 (LM7)	270 hp net	Sierra 2500 (light-duty 3/4-ton, under 8,600 lb GVWR), 2WD and 4WD
5.7L / 350 V8 (L31)	255 hp net	C/K 2500 HD and 3500 (Sierra trim), 2WD and 4WD
6.0L / 364 V8 (LQ4)	300 hp net	Sierra 2500 (light-duty 3/4-ton), 2WD and 4WD
6.5L / 395 V8 diesel (L65)	195 hp net	C/K 2500 HD and 3500 (Sierra trim), 2WD and 4WD
7.4L / 454 V8 (L29)	290 hp net	C/K 2500 HD and 3500 (Sierra trim), 2WD and 4WD

2000 Sierra HD engines

Engine	Rated	Offered in
5.3L / 325 V8 (LM7)	285 hp net	Sierra 2500 (light-duty 3/4-ton, under 8,600 lb GVWR), 2WD and 4WD
5.7L / 350 V8 (L31)	255 hp net	C/K 2500 HD and 3500 (Sierra trim), 2WD and 4WD
6.0L / 364 V8 (LQ4)	300 hp net	Sierra 2500 (light-duty 3/4-ton), 2WD and 4WD
6.5L / 395 V8 diesel (L65)	195 hp net	C/K 2500 HD and 3500 (Sierra trim), 2WD and 4WD
7.4L / 454 V8 (L29)	290 hp net	C/K 2500 HD and 3500 (Sierra trim), 2WD and 4WD

GMT800 (1999–2007)

The 6.0 and 8.1 Vortec V8s and the first Duramax 6.6.

1999 Sierra HD engines

Engine	Rated	Offered in
5.3L / 325 V8 (LM7)	270 hp net	Sierra 2500 (light-duty 3/4-ton, under 8,600 lb GVWR), 2WD and 4WD
5.7L / 350 V8 (L31)	255 hp net	C/K 2500 HD and 3500 (Sierra trim), 2WD and 4WD
6.0L / 364 V8 (LQ4)	300 hp net	Sierra 2500 (light-duty 3/4-ton), 2WD and 4WD
6.5L / 395 V8 diesel (L65)	195 hp net	C/K 2500 HD and 3500 (Sierra trim), 2WD and 4WD
7.4L / 454 V8 (L29)	290 hp net	C/K 2500 HD and 3500 (Sierra trim), 2WD and 4WD

2000 Sierra HD engines

Engine	Rated	Offered in
5.3L / 325 V8 (LM7)	285 hp net	Sierra 2500 (light-duty 3/4-ton, under 8,600 lb GVWR), 2WD and 4WD
5.7L / 350 V8 (L31)	255 hp net	C/K 2500 HD and 3500 (Sierra trim), 2WD and 4WD
6.0L / 364 V8 (LQ4)	300 hp net	Sierra 2500 (light-duty 3/4-ton), 2WD and 4WD
6.5L / 395 V8 diesel (L65)	195 hp net	C/K 2500 HD and 3500 (Sierra trim), 2WD and 4WD
7.4L / 454 V8 (L29)	290 hp net	C/K 2500 HD and 3500 (Sierra trim), 2WD and 4WD

2001 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (LQ4)	300 hp net	2500HD, 3500, 2500 (light-duty, 2001-2004), 2WD and 4WD
6.6L / 403 V8 diesel (LB7)	300 hp net	2500HD, 3500
8.1L / 496 V8 (L18)	340 hp net	2500HD, 3500

2002 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (LQ4)	300 hp net	2500HD, 3500, 2500 (light-duty, 2001-2004), 2WD and 4WD
6.6L / 403 V8 diesel (LB7)	300 hp net	2500HD, 3500
8.1L / 496 V8 (L18)	340 hp net	2500HD, 3500

2003 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (LQ4)	300 hp net	2500HD, 3500, 2500 (light-duty, 2001-2004), 2WD and 4WD
6.6L / 403 V8 diesel (LB7)	300 hp net	2500HD, 3500
8.1L / 496 V8 (L18)	340 hp net	2500HD, 3500

2004 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (LQ4)	300 hp net	2500HD, 3500, 2500 (light-duty, 2001-2004), 2WD and 4WD
6.6L / 403 V8 diesel (LB7)	300 hp net	2500HD, 3500
6.6L / 403 V8 diesel (LLY)	310 hp net	2500HD, 3500
8.1L / 496 V8 (L18)	—	2500HD, 3500

2005 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (LQ4)	300 hp net	2500HD, 3500, 2500 (light-duty, 2001-2004), 2WD and 4WD
6.6L / 403 V8 diesel (LLY)	310 hp net	2500HD, 3500
8.1L / 496 V8 (L18)	330 hp net	2500HD, 3500

2006 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (LQ4)	300 hp net	2500HD, 3500, 2500 (light-duty, 2001-2004), 2WD and 4WD
6.6L / 403 V8 diesel (LBZ)	360 hp net	2500HD, 3500
8.1L / 496 V8 (L18)	330 hp net	2500HD, 3500

2007 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (LQ4)	300 hp net	2500HD, 3500, 2500 (light-duty, 2001-2004), 2WD and 4WD
6.0L / 364 V8 (LY6)	353 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (LBZ)	360 hp net	2500HD, 3500
6.6L / 403 V8 diesel (LMM)	365 hp net	2500HD, 3500HD
8.1L / 496 V8 (L18)	330 hp net	2500HD, 3500

GMT900 (2007–2014)

The 6.0 V8 and the LMM and LML Duramax.

2007 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (LQ4)	300 hp net	2500HD, 3500, 2500 (light-duty, 2001-2004), 2WD and 4WD
6.0L / 364 V8 (LY6)	353 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (LBZ)	360 hp net	2500HD, 3500
6.6L / 403 V8 diesel (LMM)	365 hp net	2500HD, 3500HD
8.1L / 496 V8 (L18)	330 hp net	2500HD, 3500

2008 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (LY6)	353 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (LMM)	365 hp net	2500HD, 3500HD

2009 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (LY6)	360 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (LMM)	365 hp net	2500HD, 3500HD

2010 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (L96)	360 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (LMM)	365 hp net	2500HD, 3500HD

2011 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (L96)	360 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (LML)	397 hp net	2500HD, 3500HD

2012 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (L96)	360 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (LML)	397 hp net	2500HD, 3500HD

2013 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (L96)	360 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (LML)	397 hp net	2500HD, 3500HD

2014 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (L96)	360 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (LML)	397 hp net	2500HD, 3500HD

K2XX (2015–2019)

The 6.0 V8, the LML and then L5P Duramax.

2015 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (L96)	360 hp net	2500HD, 3500HD, 2WD and 4WD
6.0L / 364 V8 (LC8)	360 hp net	2500HD (bi-fuel CNG option)
6.6L / 403 V8 diesel (LML)	397 hp net	2500HD, 3500HD

2016 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (L96)	360 hp net	2500HD, 3500HD, 2WD and 4WD
6.0L / 364 V8 (LC8)	360 hp net	2500HD (bi-fuel CNG option)
6.6L / 403 V8 diesel (LML)	397 hp net	2500HD, 3500HD

2017 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (L96)	360 hp net	2500HD, 3500HD, 2WD and 4WD
6.0L / 364 V8 (LC8)	360 hp net	2500HD (bi-fuel CNG option)
6.6L / 403 V8 diesel (L5P)	445 hp net	2500HD, 3500HD

2018 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (L96)	360 hp net	2500HD, 3500HD, 2WD and 4WD
6.0L / 364 V8 (LC8)	360 hp net	2500HD (bi-fuel CNG option)
6.6L / 403 V8 diesel (L5P)	445 hp net	2500HD, 3500HD

2019 Sierra HD engines

Engine	Rated	Offered in
6.0L / 364 V8 (L96)	360 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (L5P)	445 hp net	2500HD, 3500HD

T1 (2020–2026)

The 6.6 L8T gas V8 and the L5P Duramax.

2020 Sierra HD engines

Engine	Rated	Offered in
6.6L / 401 V8 (L8T)	401 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (L5P)	445 hp net	2500HD, 3500HD

2021 Sierra HD engines

Engine	Rated	Offered in
6.6L / 401 V8 (L8T)	401 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (L5P)	445 hp net	2500HD, 3500HD

2022 Sierra HD engines

Engine	Rated	Offered in
6.6L / 401 V8 (L8T)	401 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (L5P)	445 hp net	2500HD, 3500HD

2023 Sierra HD engines

Engine	Rated	Offered in
6.6L / 401 V8 (L8T)	401 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (L5P)	445 hp net	2500HD, 3500HD

2024 Sierra HD engines

Engine	Rated	Offered in
6.6L / 401 V8 (L8T)	401 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (L5P)	470 hp net	2500HD, 3500HD

2025 Sierra HD engines

Engine	Rated	Offered in
6.6L / 401 V8 (L8T)	401 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (L5P)	470 hp net	2500HD, 3500HD

2026 Sierra HD engines

Engine	Rated	Offered in
6.6L / 401 V8 (L8T)	401 hp net	2500HD, 3500HD, 2WD and 4WD
6.6L / 403 V8 diesel (L5P)	470 hp net	2500HD, 3500HD

Working on one of these engines?

• Engine displacement from bore and stroke
• Static and dynamic compression ratio
• Which camshaft for your build
• What size carburetor
• Horsepower to torque at any RPM
• Torque converter stall speed

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