Chevrolet Kodiak / TopKick Engines by Year

GM's Kodiak and TopKick medium-duty trucks used big-block gas V8s and Caterpillar diesels, then the Duramax and Vortec 8100 in the GMT560 generation.

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

gen1 (1980–1989):

GMT530 (1990–2002):

GMT560 (2003–2009): 2003 · 2004 · 2005 · 2006 · 2007 · 2008 · 2009

gen1 (1980–1989)

GMT530 (1990–2002)

GMT560 (2003–2009)

2003 Kodiak / TopKick engines

Engine	Rated	Offered in
6.6L / 403 V8 diesel Duramax 6600	—	C4500, C5500
7.8L / 476 inline-six diesel Duramax 7800	—	C6500, C7500, C8500 (standard diesel)
8.1L / 496 V8 L18 Vortec 8100	325 hp net	C4500, C5500 (standard); Vortec MD on C6500-C8500

2004 Kodiak / TopKick engines

Engine	Rated	Offered in
7.8L / 476 inline-six diesel Duramax 7800	—	C6500, C7500, C8500 (standard diesel)

2005 Kodiak / TopKick engines

Engine	Rated	Offered in
7.8L / 476 inline-six diesel Duramax 7800	—	C6500, C7500, C8500 (standard diesel)

2006 Kodiak / TopKick engines

Engine	Rated	Offered in
7.8L / 476 inline-six diesel Duramax 7800	—	C6500, C7500, C8500 (standard diesel)

2007 Kodiak / TopKick engines

Engine	Rated	Offered in
7.8L / 476 inline-six diesel Duramax 7800	—	C6500, C7500, C8500 (standard diesel)

2008 Kodiak / TopKick engines

Engine	Rated	Offered in
6.6L / 403 V8 diesel Duramax 6600	—	C4500, C5500
7.2L / 442 inline-six diesel Caterpillar 3126E / C7	—	C6500, C7500, C8500 (optional)
7.8L / 476 inline-six diesel Duramax 7800	—	C6500, C7500, C8500 (standard diesel)
8.1L / 496 V8 L18 Vortec 8100	325 hp net	C4500, C5500 (standard); Vortec MD on C6500-C8500

2009 Kodiak / TopKick engines

Engine	Rated	Offered in
7.8L / 476 inline-six diesel Duramax 7800	—	C6500, C7500, C8500 (standard diesel)

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