The LS series is a new design intended as the only V-8 engine utilized in General Motors' line of rear-wheel-drive cars and trucks. The LS series was a clean sheet design with little in common with the classic Chevrolet small block V8. Some LS engines are all-aluminium and have 6-bolt main bearing caps.
The LS engine has been the sole powerplant of the Chevrolet Corvette since 1997 and has seen use in a wide variety of other General Motors vehicles, ranging from sport coupes to full size trucks. Due to the engine's relatively compact external dimensions compared to its displacement and power output, the engine family is also a popular choice for kit cars, hot rods, buggies, and even light aircraft.
Generation III (1997-2007)
The Generation III V-8 engines replaced the LT family in 1997. The engine blocks were cast in aluminium for car applications, and iron for most truck applications (notable exceptions include the Chevrolet TrailBlazer SS, Chevrolet SSR and a limited run of Chevrolet/GMC Extended Cab Standard Box Z71 Trucks). The architecture of the LS series makes for an extremely strong engine block with the aluminium engines being nearly as strong as the iron generation I and II engines and with the iron LS engines far exceeding the capabilities of the previous two generations. The engine also introduced coil-on-plug ignition. The traditional five-bolt pentagonal cylinder head pattern was replaced with a square four-bolt design, and the pistons are of the flat-topped variety (in the LS1, LS2, LS3, LS6, LS7, LQ9 and L33), while all other variants, including the new LS9 received a dished version of the GM hyperutectic piston. The cylinder firing order was changed to 1-8-7-2-6-5-4-3, so that the LS series now corresponds to the firing pattern of other modern V8 engines (for example the Ford Modular V8).
3.90 in bore blocks (1997-2005)
The first of the Generation IIIs, the LS1 was the progenitor of the new architecture design that would transform the entire Chevy V8 line and influence the last of the Big Blocks.
5.7 L
The 5.7 L shares little other than similar displacement, external dimensions, and rod bearings, with its predecessor. It is an all-aluminium 5,665 cc (5.665 L; 345.7 cu in) pushrod engine with a bore of 3.9 in (99.1 mm) and a stroke of 3.62 in (91.9 mm).
LS1The LS1 was rated at 350 hp (260 kW) and 365 lb·ft (495 N·m) in North America, depending on the application. The LS1 was used in the Corvette from 97-04. It was also used in GM F-Body cars with a rating of 305HP - 315HP. In Australia, continuous modifications were made to the LS1 engine throughout its lifetime, reaching 382 bhp (285 kW) in the HSV's YII series, and a Callaway modified version named "C4B" was fitted to HSV GTS models producing 402 bhp (300 kW).
Applications:
- 1997-2004 Chevrolet Corvette C5, excluding Z06
- 1998-2002 Chevrolet Camaro Z28, SS
- 1998-2002 Pontiac Firebird Formula, Trans Am
- 2004 Pontiac GTO
- 1999-2005 Holden Commodore Ute
- 1999-2005 Holden Commodore (VT, VX, VY, VZ)
- 1999-2005 Holden Statesman (WH, WK, WL)
- 1999-2005 Holden Caprice (WH, WK, WL)
- 1999-2004 Holden Special Vehicles (all V8 models)
- 2001-2005 Holden Monaro CV8
- 2006-2007 Elfin MS8 Streamliner
LS6
The LS6 is a higher-output version of GM's LS1 engine and retains the same capacity. The initial 2001 LS6 produced 385 bhp (287 kW) and 385 lb·ft (522 N·m), but the engine was modified for 2002 through 2004 to produce 405 bhp (302 kW) and 400 lb·ft (542 N·m) of torque. The LS6 was originally only used in the high-performance C5 Corvette Z06 model, with the Cadillac CTS V-Series getting the 400 bhp (300 kW) engine later. The V-Series used the LS6 for two years before being replaced by the LS2 in 2006. For 2006, the Z06 replaced the LS6 with the new LS7.
The LS6 shares its basic block architecture with the GM LS1 engine, but other changes were made to the design such as windows cast into the block between cylinders, improved main web strength and bay to bay breathing, an intake manifold and MAF-sensor with higher flow, a camshaft with higher lift and more duration, a higher compression ratio, sodium filled valves, and a revised oiling system better suited to high lateral acceleration.
A number of LS6 intake manifolds were also used on some 2001-2002 Chevrolet Camaros.
The casting number, located on the top rear edge of the block, is 12561168.
Applications:
- 2001-2004 Chevrolet Corvette C5 Z06
- 2004-2005 Cadillac CTS V-Series
3.78 in bore blocks (1999-2007)
The 4.8 L and the 5.3 L are smaller truck versions of the LS1 and were designed to replace the 305 and the 350 in trucks. Both the 4.8 L and the 5.3 L share the same engine block and heads. Although the block of the 4.8 L/5.3L looks similar to the LS1, they are not of the same blocks.
4.8 L
The Vortec 4800 is a small block V8 truck engine. Displacement is 4.8 L (~293 cu in) with a 96.01 mm bore and 83 mm stroke. It is the smallest of the Generation III Vortec truck engines and was the replacement for the 5.0 L 5000 L30. The Vortec 4800 produces 270 horsepower (200 kW) to 295 horsepower (220 kW) and 285 lb·ft (386 N·m) to 305 lb·ft (414 N·m), depending on the model year and application.
5.3 L
The Vortec 5300 is a V8 truck engine. It is a stroked (by 9 mm) version of the Vortec 4800 and replaced the 5700 L31. Power output is 285-295 hp (213-220 kW) and torque is 325 lb·ft (441 N·m) to 335 lb·ft (454 N·m). Displacement is 5.3 L (5,328 cc (325.1 cu in)) from 96.01 mm bore and 92.00 mm stroke.
4.00 in bore blocks (1999-2007)
The 6.0 L is a larger truck version of the LS1 and was designed to bridge the gap between the new small blocks and big blocks in truck applications. There were two version of this engine the LQ4 and the LQ9 being more performance oriented. Although the block of the 6.0L looks similar to the LS1, they are not of the same blocks.
6.0 L
The Vortec 6000 is a V8 truck engine. Displacement is 6.0 L (~366 cu in) from 101.6 mm bore and 92 mm stroke. It is an iron/aluminium (2000 model year engines had cast iron heads) design and produces 300 horsepower (220 kW) to 345 horsepower (257 kW) and 360 lb·ft (488 N·m) to 380 lb·ft (515 N·m).
Generation IV (2005-Current)
In 2005, the Generation III was superseded by the Generation IV . This category of engines has provisions for high-displacement ranges up to 7,011 cc (7.011 L; 427.8 cu in) and power output to 638 bhp (476 kW). Based on the Generation III design, Generation IV was designed with displacement on demand in mind, a technology that allows 4 cylinders in alternating fashion from side to side and front to back to be deactivated. It can also accommodate variable valve timing.
A 3-valve per cylinder design was originally slated for the LS7, which would have been a first for a GM pushrod engine; but the idea was shelved owing to design complexities and when the same two-valve configuration as the other Generation III and IV engines proved to be sufficient to meet the goals for the LS7.
4.00 in bore blocks (2005-Current)
This family of blocks were the first of the generation IV small block with the LS2 being the progenitor of this family and generation. This family of blocks has seen a wide range of applications from performance vehicles to truck usage.
6.0 L
LS2
The LS2 was introduced as the Corvette's new base engine for the 2005 model year. It also appeared as the standard powerplant for the 2005-2006 GTO. It produces 400 bhp (300 kW)@6000rpm and 400 lb·ft (542 N·m)@4400rpm from a slightly larger displacement of 5,967 cc (5.967 L; 364.1 cu in). It is similar to the high-performance LS6, but with improved torque throughout the rpm range. The LS2 uses the "243" casting heads used on the LS6 (although without the sodium filled valves), a smaller camshaft, and an additional 18 cubic inches. The compression of the LS2 was also raised to 10.9:1 compared to the LS1s 10.25:1 and the LS6s 10.5:1. The LS2s in the E-series HSVs are modified in Australia to produce 412 bhp (307 kW) and 412 lb·ft
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