The Duramax 2.8-liter turbodiesel I-4 only makes 181 hp, but its 369 lb-ft of torque gets the little(ish) Chevy truck moving with authority. ... our year with the 2016 Chevrolet Colorado Z71 4x4 ...Jun 17, 2022 · The Iconic 2011-2016 6.6-liter LML Duramax V-8 engine is the capstone of GM’s Pre-L5P turbodiesels. ... when it was replaced by the all-new 6.6-liter Duramax L5P. During those 15 years, DMAX Ltd ... The Duramax years to avoid are LB7 from 2001 to 2004, LLY from 2004 to 2006, LBZ from 2005 to 2006, LMM from 2007 to 2010, and the LML from 2011 to 2016. These are the …– Engineerine. Best & Worst Years Of Duramax Engine (Cars To Avoid!) Last Updated on January 18, 2024 by Abed Serhan. The Duramax engine has been one …Sep 1, 2014 ... Active member ... 01-10 will physically go in an any year block. Balancer and flywheel have to be correct for that crank. Lb7 and LLY share the ...Feb 1, 2023 · Which Duramax years to avoid? There are great Duramax engine models out there for you to try; however, there are specific model years that you should avoid. Below, we give a rundown of these years to avoid. Duramax LB7: 2001-2004 model years. As the first Duramax model to be released, the LB7 is still very popular among diesel enthusiasts due ... Jan 9, 2023 ... 211K views · 1 year ago ...more. Pickup Truck ... 3.0 Duramax 120,000 Mile Review | Chevy 1500 ... 3.0 Duramax vs 5.3L EcoTec3 - Which is Better?The Duramax Is An Extremely Strong Engine . It is often the case that new engines produce a lot of power, but do not have internals strong enough to support that power for years of usage.LMM 2007.5- 2010 Started DPF for emissions, all years before had EGR coolers and valves, with the exception of some LB7 engines. LML 2011 EGR, DPF, and DEF fluid emissions equipment. CP4 issues and issues with def fluid have been the most prodiminant issues, strong running engines and plenty of power from the factory.Nov 29, 2018 · The RHG6 model turbocharger aboard the LB7 marked the only time a fixed geometry unit was used on a Duramax. Manufactured by IHI Turbo America, the RHG6 sported a 60.6mm (inducer) compressor wheel and a 68mm (exducer) turbine wheel, along with a wastegate. In factory form, the IHI charger sees a maximum peak boost of 22 to 24 psi. The Duramax LLY engine lasts for around 200000 miles or 321869 kilometers without needing any major maintenance or repairs. It has a 95% GM user rating. It means 95% of Duramax LLY engines last over 200000 miles without any major issues. However, the lifespan of an LLY Duramax depends on the maintenance of the engine as well as the …Performance Roadblocks of the LBZ Duramax. While ’01-’10 Duramax engines share a lot of things in common and experience many of the same hurdles in making horsepower, these power plants are all a tad different in their own ways. The slight differences from year to year (or RPO code to RPO code) stem from GM’s attempt to …Feb 26, 2014 · The next few generations of the Duramax delivered solid upgrades to the design. Most companies would have made these running changes, but GM identified each revision as a different model. The next revision, referred to as the LLY, was a mid-year change in 2004. The easiest way to tell whether the engine is an LB7 or an LLY is by the valve covers. Fifth Generation Sierra 2500HD Production Years: 2024 GMC Sierra 2500HD Review. TRIM ENGINE TRANSMISSION DRIVETRAIN GMTT1XX Pro 6.6L Turbo V8 Diesel 6.6L V8 Gas 10-Speed Automatic ...Dec 17, 2020 · 2017-2019 Chevrolet HD and GMC HD trucks with the L5P Duramax have a max tow capacity of 23,300 lbs. In 2020, GM’s engineers overhauled the trucks and increased tow capacity by 52%. 2020 Chevrolet HD and GMC HD trucks with L5P Duramax engines have a max tow capacity of 35,500 lbs. Then, in 2021, slight revisions improved max tow capacity a ... Going to Mars for a year requires that you take a substantial amount of food and water with you. Find out how much you need to take if you're living on Mars. Advertisement Another ...2006-2007 LBZ has the problems from previous generations fixed, and now the weak link is pistons. These also have 6 speed transmissions instead of the 5 speeds. 2007.5-2010 LMM has the DPF system but is otherwise the same as the 2006-2007 LBZ. 2011-2016 LML has DPF and DEF. Changed the injection pump from a CP3 to a CP4.GM 6.6L L5P V-8 Duramax Turbo Diesel Engine Vehicle Applications; Model Year Vehicle Transmission Power (hp / kW) @ RPM Torque (lb-ft / Nm) @ RPM; 2017 – 2023The horsepower of a 6.6 Duramax varies depending on the model year and specific engine configuration. For example, the 2023 GMC Sierra 2500HD with the Duramax 6.6L Turbo-Diesel V8 engine has a horsepower rating of 445 hp @ 2,800 rpm. However, older models may have lower horsepower ratings.Piper One. 3756 posts · Joined 2021. #2 · Nov 21, 2023. 01 to 05, Allison 5 speed. 06 to 19 Allison 6 speed. These are 1000 series Allison designs. The 6 speed had a double overdrive (6th gear was .61). Stock power and proper fluid and they live well. 2020 up, Allison branded 10 speed.See full list on chevytrucks.org Nov 14, 2018 ... As of 2018, a total of 7 generations of the Duramax diesel have been produced. The LB7 was first introduced in late 2000 for the 2001 model year ...The 3-liter Duramax is an inline-6 engine that debuted in 2019 for the 2020 model year, and generated 277 horsepower with 460 pound-feet of torque.Piper One. 3756 posts · Joined 2021. #2 · Nov 21, 2023. 01 to 05, Allison 5 speed. 06 to 19 Allison 6 speed. These are 1000 series Allison designs. The 6 speed had a double overdrive (6th gear was .61). Stock power and proper fluid and they live well. 2020 up, Allison branded 10 speed.4-Inch Exhaust System: $260. Nearly all of the exhaust systems available for the LBZ Duramax can also be used on the LB7 (’01-‘04), LLY (’04.5-‘05) and even the LMM (’07.5-‘10). Diamond Eye Performance ’s 4-inch diameter, downpipe-back, aluminized exhaust system (shown) is one of these systems. Depending on where you shop, it will ...Our journey through the progression of Duramax diesel engines will examine how these engines have reshaped expectations and set new standards in the diesel domain since their debut in 2001. From the very first LB7 model to the latest advancements, Duramax engines have undergone significant transformations, each iteration pushing the boundaries ...Discover the evolution and unique features of Duramax engines, from the pioneering LB7 to the cutting-edge L5P. Understand key differences and make an informed decision for your truck's diesel engine needs. ... and innovation, Duramax engines have been a staple in the automotive industry for years. Fast forward to the present day, and …The horsepower of a 6.6 Duramax varies depending on the model year and specific engine configuration. For example, the 2023 GMC Sierra 2500HD with the Duramax 6.6L Turbo-Diesel V8 engine has a horsepower rating of 445 hp @ 2,800 rpm. However, older models may have lower horsepower ratings.Chevrolet Silverado 2500 HD LTZ Crew Cab Pickup. The LML Duramax shocked its rivals when it was revealed, offering 397 horsepower and 765 lb-ft of torque while simultaneously lowering emissions and improving fuel economy. A new, improved engine block casting was used. GM increased oil film thickness by changing the main …November 20, 2023 by Alex Jones. Duramax started using def in their diesel engines in 2011 for compliance with federal emissions regulations. Duramax implemented def to reduce nox emissions and meet stricter epa guidelines on diesel exhaust fluid emissions. Diesel engines are popular due to their long-lasting performance and fuel efficiency.The most reliable year of Duramax is the model produced from 2011 to 2021. These models include the Duramax LGH, Duramax LML, Duramax XLD25, Duramax XLD28, Duramax LWN, Duramax L5P, and …Performance Roadblocks of the LBZ Duramax. While ’01-’10 Duramax engines share a lot of things in common and experience many of the same hurdles in making horsepower, these power plants are all a tad different in their own ways. The slight differences from year to year (or RPO code to RPO code) stem from GM’s attempt to …The LBZ is great in stock form, but get horsepower numbers above 600, and it needs some upgrades to survive. LMM: 2007.5 Through 2010. The LMM engine ushered in the emissions era of Duramax. Although the LMM is almost the same as the LBZ, which makes it a very good engine, it features several new emissions control devices.Today we're going to go on a journey and look at every Duramax engine that GM has built, from the LB7 all the way up to L5P. We're going to look at what make... The Duramax L5P was launched in 2017 and made an appearance in models like the 2017 GMC Sierra HD and the 2017 Chevrolet Silverado HD. Producing 445 hp and 910 lb-ft of torque, this was one of GM ... DMAX Ltd. Turns Out Number 2 Million. At the time of its release for ’17 model year Chevy Silverado and GMC Sierra HDs, the L5P Duramax belted out a class-leading 445hp, along with an impressive 910 lb-ft of torque at just 1,600 rpm. As a result, an unladen ¾-ton crew cab 4x4 could sprint from 0 to 60 mph in just over six seconds—not …The RHG6 model turbocharger aboard the LB7 marked the only time a fixed geometry unit was used on a Duramax. Manufactured by IHI Turbo America, the RHG6 sported a 60.6mm (inducer) compressor wheel and a 68mm (exducer) turbine wheel, along with a wastegate. In factory form, the IHI charger sees a maximum peak boost of 22 to 24 psi.Filter fuel better, make sure you always get clean fuel, keep and eye on your balace rates. Great engines, LB7 injectors outflow all other injectors in stock form in terms of lpm and tend to get the best mileage per gallon. LLY is 2004.5 and 2005 some have headgasket issues due to a lacking cooling system.Fifth Generation Sierra 2500HD Production Years: 2024 GMC Sierra 2500HD Review. TRIM ENGINE TRANSMISSION DRIVETRAIN GMTT1XX Pro 6.6L Turbo V8 Diesel 6.6L V8 Gas 10-Speed Automatic ...May 4, 2023 · The Duramax was a late-year arrival for the 2019 Chevy Silverado 1500 and GMC Sierra 1500 pickups, with the 2020 model year being the first full year of availability. It was matched to the GM ... See All 64 Photos. The 6.6L Duramax L5P is an entirely new powerplant. The development of this fifth-generation V-8 is more of a rebirth than an evolution. Every single part, down to the nuts and ...The horsepower of a 6.6 Duramax varies depending on the model year and specific engine configuration. For example, the 2023 GMC Sierra 2500HD with the Duramax 6.6L Turbo-Diesel V8 engine has a horsepower rating of 445 hp @ 2,800 rpm. However, older models may have lower horsepower ratings.About two or three weeks ago, we put a video talking about Duramax engines and we went through every engine from the LB7 up to the L5P. We even covered some ...The safest Duramax model years you can buy are the models produced from 2011 to 2021. These include the Duramax LGH, Duramax LML, Duramax XLD25, Duramax XLD28, Duramax LWN, Duramax L5P, and Duramax LM2. These engines go a step further to provide better emissions thanks to a diesel exhaust fluid/urea injection feature.The inaugural Duramax, RPO code LB7, would bring the first aluminum cylinder heads to the diesel pickup segment, introduce the same market to common-rail …Duramax History, Lesson 2: LLY. Midway through the 2004 model year, GM released the second-generation Duramax, RPO code LLY. Although much of the LLY’s internals match what you’ll find in the LB7, this version of the 6.6L V8 brought an improved injector design, variable geometry turbocharging and cleaner emissions to the table.Duramax diesel has been an option across a complete line of light and medium-duty trucks, cars, and Duramax is a cooperative undertaking between General Motors and Isuzu. What Year Chevrolet and GMC Trucks Require DEF. In 2007, Duramax produced a 6.6L engine with new diesel particulate filter technology.The 2007 to 2010 model years of 2500 HD and 3500 trucks featured a new body style, vastly improved interior, and the first version of the Duramax LMM engine to have an exhaust after-treatment process that required fuel for it to function.Key Components of Duramax Engines. If you want to achieve 30 mpg with a Duramax engine, it’s important to understand the key components that make up the engine. Some of the most important components include the turbo, transmission, injectors, cooling system, and turbo system.. Related article!: Worst Years For The DuramaxOnce the OBS was discontinued, the Silverado truck took over in 1999. However, the Cateye didn’t get released until a few years later. Looking at similarities, both of these Chevy models are considered quite dependable. The fact that the C/K Series was produced for ten years proves that it was reliable and popular.Jun 17, 2022 · The Iconic 2011-2016 6.6-liter LML Duramax V-8 engine is the capstone of GM’s Pre-L5P turbodiesels. ... when it was replaced by the all-new 6.6-liter Duramax L5P. During those 15 years, DMAX Ltd ... The 2007 model year marked significant changes across the GM truck lineup. With the all-new Chevrolet Silverado and GMC Sierra 1500 (1/2-ton) models already introduced for 2007, the all-new Heavy-Duty version of the GM trucks were released roughly mid-model year (often referred to as a 2007.5). ... The Duramax LMM is a durable …Depending on the year and model, the Duramax engine can produce anywhere from 235 to 445 horsepower and 500 to 910 lb-ft of torque. The benefits of the Duramax engine are numerous. It is known …As a result, you have to be careful while buying some Duramax models from the undermentioned years. The following are the years and their problems: LB7 Duramax (2001-04) LB7 Duramax was the first generation of the V8 Duramax engine and it did quite well. It was reliable and gave quite a raw feel like the one that diesel enthusiasts crave …In conclusion, the Duramax engine is reliable and durable overall, but certain years offer more reliable performance than others. The best years are 2001-2004, 2006-2007, and 2011-2016, while the worst are 2005, 2008-2010, and 2017-2020. It is recommended to avoid cars with these engines, if possible, to get the most reliable performance.Jul 6, 2021 · LB7: 2001 – 2004. As the original Duramax model, the LB7 is still extremely popular with diesel enthusiasts due to its lack of emissions control parts. In general, it’s a very durable and reliable engine. However, as the first models hit the 100,000-mile mark, some issues cropped up. Injector failure was a common problem on the LB7 engines. History was made in January 2001 when General Motors introduced its first Duramax diesel engine for the 2002 model year Chevrolet Silverado and GMC Sierra heavy-duty trucks —a 6.6-liter V-8...The History of Duramax engines. Whatever its year or generation, every Duramax is a 6.6L V8 unit. Unlike Cummins or Ford, who altered key engine features such as displacement, cylinder head design or fuel injection throughout the years, GM has retained the same general layout from the beginning.GM 6.6L L5P V-8 Duramax Turbo Diesel Engine Vehicle Applications; Model Year Vehicle Transmission Power (hp / kW) @ RPM Torque (lb-ft / Nm) @ RPM; 2017 – 2023As a result, a number of much-awaited models at the time featured the 6.6-liter LBZ Duramax, including the Chevrolet Kodiak, GMC TopKick, GMC Sierra, and the. Chevrolet Silverado, which has ...The name Duramax was chosen for the new engine to signify durability and maximum power, cleanliness, and fuel economy. The new engine created and built by DMAX Ltd was a 6,599 cubic centimeter (6.6 Liter), direct-injection, turbo-charged Diesel V8 with 90-degree placement, aluminum cylinder heads, and 32 overhead valves.May 4, 2016 · Saids they get better every year. Seems to have problems with his 2016 though, brake controller replaced and now steering rack @ 50,000 miles. 2010 Gmc 2500 Duramax 853,500 Odometer miles - sold Nov 2018. 2013 LT CCSB SRW bought with 508,000 miles, now over 703,000 miles. May 27, 2007 · The very best years to own are the 06-07 LBZ (Classic Body). The 07.5 is the new LMM new body style and has the DPF on it which robs fuel mileage. The LBZ has the most hp and torque only a catalytic converter in thye exhaust system that is easily done away with. The least problems are with the LBZ models. A little over 3 years after the initial concept, the LB7 Duramax diesel went into production. The resulting engine was a state-of-the-art 6.6L V8 with four-valves-per-cylinder. The LB7 put out a segment-best 300 hp and 520 lb-ft of torque. The LB7 Duramax was considered revolutionary at the time and utilized a turbocharger, intercooler, and ...carter_44. 4571 posts · Joined 2008. #5 · Jun 20, 2010. The Duramax is a great motor in a great truck with a great transmission behind it. The Cummins is a great motor in a piece of **** truck with a questionable transmission. That should be all you need to know. The Duramax is the superior truck.– Engineerine. Best & Worst Years Of Duramax Engine (Cars To Avoid!) Last Updated on January 18, 2024 by Abed Serhan. The Duramax engine has been one …Nov 30, 2023 ... ... Diesel Customs•8.2K views · 17:18 · Go to channel · What Is The Worst Year Duramax Ever Made? EXPLAINED! Truck Master•459K views · ...To build this powerful workhorse, GM partnered with Japanese auto manufacturer Isuzu, and the result was the legendary Duramax V8, which has retained its basic architecture for more than 20 years now.Personally, as of now, the LML years (11-16) are the only ones that I would try to avoid unless the CP4 was replaced with a CP3. The L5P’s seem to be pretty solid. If I ever update from my LBZ I will be looking to jump into a K2 platform L5P most likely. 2006 Silverado 2500 4x4. LBZ.And you stop noticing everyone you pass-checking you out as you drive by. H1 Duramax TurbodieselA 2-inch body lift was required to fit the Isuzu/GM-designed 6.6L Duramax where the original 6.2/6 ...Best Duramax years. The Duramax can be an excellent engine for your truck if you avoid the model years above and stick to its durable and reliable ones. Below, we …Filter fuel better, make sure you always get clean fuel, keep and eye on your balace rates. Great engines, LB7 injectors outflow all other injectors in stock form in terms of lpm and tend to get the best mileage per gallon. LLY is 2004.5 and 2005 some have headgasket issues due to a lacking cooling system.Ford has been working on single-cylinder diesel engines in its labs since 2001 and has built diesel engines in Europe for years. Ford partnered with the ...Today we're going to go on a journey and look at every Duramax engine that GM has built, from the LB7 all the way up to L5P. We're going to look at what make... 2006-2007 LBZ has the problems from previous generations fixed, and now the weak link is pistons. These also have 6 speed transmissions instead of the 5 speeds. 2007.5-2010 LMM has the DPF system but is otherwise the same as the 2006-2007 LBZ. 2011-2016 LML has DPF and DEF. Changed the injection pump from a CP3 to a CP4. – Engineerine. Best & Worst Years Of Duramax Engine (Cars To Avoid!) Last Updated on January 18, 2024 by Abed Serhan. The Duramax engine has been one …Best Duramax Years . The Duramax engine is a diesel engine produced by General Motors. It was first introduced in the 2001 model year and has been used in a variety of GMC and Chevrolet trucks and SUVs since then. The Duramax is known for its high torque output and fuel efficiency, as well as its reliability. So, what are the best Duramax years?The GM Duramax 3.0L I-6 LM2 is a turbo-diesel engine produced by General Motors for use in various vehicles, primarily full-size half-ton pickup trucks and full-size SUVs. ... 2019 model year ...The Duramax years to avoid are LB7 from 2001 to 2004, LLY from 2004 to 2006, LBZ from 2005 to 2006, LMM from 2007 to 2010, and the LML from 2011 to 2016. These are the …Nov 30, 2023 ... ... Diesel Customs•8.2K views · 17:18 · Go to channel · What Is The Worst Year Duramax Ever Made? EXPLAINED! Truck Master•459K views · ...2006 to 2007 Duramax LBZ. 2006-2007 Duramax LBZ is among the best year generations certified by many owners. First of all, let’s say that all the generations are good, but for some features, 2006-2007 stands out among the competition. The 2006 to 2007 Duramax was a 6.6L turbo-diesel engine produced by General Motors.Piper One. 3756 posts · Joined 2021. #2 · Nov 21, 2023. 01 to 05, Allison 5 speed. 06 to 19 Allison 6 speed. These are 1000 series Allison designs. The 6 speed had a double overdrive (6th gear was .61). Stock power and proper fluid and they live well. 2020 up, Allison branded 10 speed.The GM L5P Duramax is a turbo-diesel engine produced by General Motors for use in full-size heavy-duty (HD) pickup trucks. Displacing 6.6 liters in a V-8 configuration, the L5P is part of a new ...Reaction score. 1,930. Location. Rocky View County, AB. Nov 25, 2015. #3. 01-02 = Early LB7 - These are the first generation of Duramax. They have known poor injectors which fail once or twice throughout the life of the engine. They sometimes blow head gaskets to combustion but its not a huge issue.Dec 10, 2018 · Duramax History, Lesson 3: LBZ. December 10, 2018. Story By. Mike McGlothlin. By the time the LBZ came along, the LB7 ’s injector issues had long been solved and the overheating issues associated with the LLY were a thing of the past. This engine’s beefier block casting, stronger connecting rods, higher pressure common-rail fuel system and ... The 6.6-liter LBZ Duramax V8 diesel engine was introduced midway through the 2006 model year, when it replaced the 6.6 liter LLY Duramax variant. As such, it powered Chevrolet Silverado Heavy-Duty ...Jan 26, 2022 ... ... :25 Under The Truck 14:29 Ending. 2001-2007 Duramax LB7/LLY/LBZ Buyers Guide. 34K views · 2 years ago ...more. Dirty Diesel Customs. 4.67K.The exact MPG any engine gets depends on the vehicle it’s used in, but the 6.6-liter Duramax diesel engine gets an EPA-estimated 15 MPGs in city driving and 20 MPGs on highway driv...The LB7 Duramax was first introduced for the 2001 model year in the Chevrolet Silverado HD, GMC Sierra HD, GMC TopKick (medium duty) and Chevrolet Kodiak (medium duty) trucks. That year also brought the Allison 1000, arguably the first automatic transmission in its class worthy of being mated to a powerful diesel.
Mar 19, 2024 · The safest Duramax model years you can buy are the models produced from 2011 to 2021. These include the Duramax LGH, Duramax LML, Duramax XLD25, Duramax XLD28, Duramax LWN, Duramax L5P, and Duramax LM2. These engines go a step further to provide better emissions thanks to a diesel exhaust fluid/urea injection feature. . Lennar next gen homes floor plans
As previously stated, the first model year of Duramax was 2001 with the LB7 engine code. This model featured a 3.5″ exhaust system with a catalytic converter and a muffler. This basic system was utilized all the way through 2007 model years ending with the LBZ engine code. The factory exhaust is relatively adequate for engines producing …May 27, 2022 · The LML Duramax, introduced for the 2011 model year was a powerhouse. Coming out of the gate with 397hp and 765 lb/ft of torque, this Duramax diesel featured an advanced fuel injector design and increased line pressure to 30,000 psi compared to 26,000 on the LMM. The 6.6-liter Duramax LBZ was a short-lived engine only available for two model years. To meet increasingly strict emissions standards, the LBZ was a more aggressively tuned version of the …Fifth Generation Sierra 2500HD Production Years: 2024 GMC Sierra 2500HD Review. TRIM ENGINE TRANSMISSION DRIVETRAIN GMTT1XX Pro 6.6L Turbo V8 Diesel 6.6L V8 Gas 10-Speed Automatic ...Once the OBS was discontinued, the Silverado truck took over in 1999. However, the Cateye didn’t get released until a few years later. Looking at similarities, both of these Chevy models are considered quite dependable. The fact that the C/K Series was produced for ten years proves that it was reliable and popular.Oct 25, 2022 ... I've put 57k on mine in two years. Including hauling a truck camper all over the west up and down mountain passes in 90 deg temps without a ...Fuel System Problems. Your Duramax relies on a clean and unobstructed fuel supply. Issues with the fuel filter, fuel line, or fuel injectors can cause reduced engine power. A faulty injector can disrupt the fuel mixture, and clogged fuel filters restrict fuel flow, both potentially leading to limp mode activation for protection.Duramax started using the DEF in 2011. Stricter emission regulations require improvements to different systems of a car. With the popularization of biodiesel, the fuel in diesel engines became cleaner. The DEF is one of the most successful ways to reduce NOx emissions. The reduction can go up to 90%.If you’re looking for an engine that won’t trouble you much, we recommend the following Duramax year models: 2010 – 2017 Duramax LGH; 2011 – 2016 Duramax …Focus on the model of engine for a given year as prior to the introduction of the LML engine in 2011 there were changes every year or two to correct a defect for the prior model engine. The LB7 and early LLY engines were prone to injector failure. These engines also greatly benefit from adding a lift pump.Jun 3, 2019 · 2001 was a huge year for GM lovers across the United States. Not only was 2001 the start of the Duramax engine, but also the famous Allison 1000 Transmission. This first Duramax engine mated with GM trucks was coined the LB7 Duramax. Fifth Generation Sierra 2500HD Production Years: 2024 GMC Sierra 2500HD Review. TRIM ENGINE TRANSMISSION DRIVETRAIN GMTT1XX Pro 6.6L Turbo V8 Diesel 6.6L V8 Gas 10-Speed Automatic ...Duramax History, Lesson 3: LBZ. December 10, 2018. Story By. Mike McGlothlin. By the time the LBZ came along, the LB7 ’s injector issues had long been solved and the overheating issues associated with the LLY were a thing of the past. This engine’s beefier block casting, stronger connecting rods, higher pressure common-rail fuel system and ....