Gmc GM 6.6L Duramax V8 Diesel

Gmc GM 6.6L Duramax V8 Diesel — every model and year that used this engine (15 models, 2001–present), based on NHTSA VIN build data, with links to prices and reliability.

HD trucks turbo-diesel.

6.6L · 8 cylinders · 57% of builds flagged turbo · seen in 15 models, 2001–2026

By the numbers

Gasoline: 32%. Diesel: 68%. Based on 2,080 decoded NHTSA VIN build sheets.

About this engine family

The Duramax V8 engine is a family of 6.6-liter diesel V8 engines produced by DMAX, a wholly owned subsidiary of General Motors in Moraine, Ohio. The Duramax block are supplied by Fritz Winter, a German foundry. The heads are supplied from reliable vendors of General Motors. This engine was initially installed in 2001 Chevrolet and GMC trucks, and has since become an option in pickups, vans, and medium-duty trucks. In 2006, production at Moraine was reportedly limited to approximately 200,000 engines per year.

On May 9, 2007, DMAX announced the production of the 1,000,000th Duramax V8 at its Moraine facility, followed by the 2,000,000th on March 24, 2017.

In detail

RPO LB7 (engine code "1") was first introduced in 2001 and continued until early 2004. It featured a 32-valve design with high-pressure common-rail direct injection and aluminum cylinder heads. The following trucks use the LB7: Chevrolet Kodiak/GMC TopKick * Chevrolet Silverado/GMC Sierra HD * Block / Head: Cast Iron / Aluminum * Compression: 17.5:1 * Injection: Direct; Bosch high-pressure common-rail * Power / Torque: at 3,100 rpm / at 1,800 rpm The LLY was introduced in 2004 and completely replaced the LB7 mid-year.

The LLY (internally called the 8GF1) (engine code "2") is a turbocharged engine which debuted in mid-2004 and continued until the end of 2005 (except the Hummer H1 in 2006). It is a 32-valve design with high-pressure common-rail direct injection and aluminum cylinder heads. The LLY was GM's first attempt to implement emissions requirements on their diesel trucks. To meet this goal, they turned to a newly developed Garrett turbocharger with a variable geometry vane system and installed an EGR valve.

Learning from problems with injectors in the previous LB7, GM changed the valve covers to allow access to the injectors without having to remove the valve covers, saving significant labor costs if injector replacement became necessary. The following trucks used the LLY engine: * 2006-only Hummer H1 Alpha * Chevrolet Silverado/GMC Sierra 2500HD/3500 * Block / Head: Cast gray iron / Cast aluminum * Compression: 17.5:1 * Injection: Bosch high-pressure common-rail * Power / Torque: at 3000 rpm / at 1600 rpm * Head casting is 8GF1 * Block casting is 22351021213 There are two VIN codes for the LBZ.

The first is VIN 2 produced in late 2005 and early 2006. The VIN 2 engine is mechanically and physically the same as the VIN D engine but utilizes LLY engine tuning due to the LBZ tuning taking longer to be EPA certified and placed into production. The second is VIN D. This was introduced in 2006 and continued into 2007 sold only in the "classic" body style. It has an improved engine computer tune that produces increased power and torque over the 2005 LLY version of the engine.

This also marked the first appearance of the Duramax in the Express/Savana vans. The LBZ is one of the more sought-after Duramax engines because of its strength, reliability, and being pre-emissions (DPF appeared on the next generation LMM in 2007).

Source: Wikipedia — Duramax V8 engine, CC BY-SA.

Models that used this engine

Model Years with this engine Fuel VIN builds seen
SIERRA 2001–2021 Diesel 997
SIERRA HD 2019–2026 Gasoline 695
SAVANA 2006–2026 Gasoline 269
C5 2003–2009 Diesel 65
C4 2003–2009 Diesel 38

Engine usage derived from NHTSA VIN build data (displacement + cylinder configuration). Model links lead to prices, generations and reliability.

For sale with this engine