LS2
The LS2 (VIN code U) replaced the LS1 in the Corvette in 2005. It used the new Gen. 4 block and the cathedral port heads from the LS6. The LS2 added more Displacement and better heads for more Horsepower and Torque .
The LS2 was available in the Corvette and the CTS-V until 2007. It was also used in the GTO in 2005 and 2006.
L76
The L76 was an adapted version of the LS2. It used new rectangle port cylinder heads. It was also upgraded with Active Fuel Management (AFM) . The L76 was available in the Pontiac G8 GT from 2007-09. It was also used in some Australian Holden cars.
L77
The L77 was the Police car version of the L76. It added flex fuel capability. It was available in the Caprice PPV from 2011-17. It was also used in some Australian vehicles between 2011-15.
For specific details about these engines, please follow the links below:
- Chevy LS2 Car Engine Specs (VIN U)
- Chevy L76 Car Engine Specs
- Chevy L77 Engine Specs
- Upgrading the LS2, L76, and L77 Engines
Benefits
These engines have a 4.000 in. cylinder bore and internal oil passages for AFM, even if it wasn't used. The cylinder walls are thicker than the 6.2L engines. That means they can handle more boost and around 1,000 hp.
The cylinder heads are great too!
- The LS2 used the same cathedral port heads as the LS6 .
- The L76 and L77 used the same rectangle port heads as the LY6 and L96 and L92 and L9H..
What's the difference?
The easiest way to tell the difference is to check the 8th digit of the VIN code.
- Follow this link to Identify an LS Engine by VIN.
The difference between the engines is the heads and the special technology used on each one.
- Follow this link to Identify AFM.
- For fuel compatibility, you can pull the injectors.
| RPO Code | AFM | VVT | Holes in the Injector Spray Nozzle | Cylinder Head Casting Number |
| LS2 | No | No | 2 | 799 or 243 |
| L76 | Yes | No | 4 | 5364 or 823 |
| L77 | Yes | No | 16 | 5364 or 823 |
Special Notes
- All 2005-06 LS2 engines had the 24x reluctor and 1x cam gear, like the Gen. 3 engines.
- All engines built in 2007 or later had the standard Gen. 4 58x reluctor and 4x cam gear.
- The LS2 and L76 were also available in truck versions.
- Follow this link to learn more about The LS2 and L76 Truck Engines.
- The L98 was another member of the Gen. 4, 6.0L, car engine family. However, it was only available in Australian Holden vehicles.
| RPO Code (Years) | AFM | VVT | Flex Fuel | Cylinder Head |
| L98 (2006-10) | No | No | No | Rectangle Port |
**It had the AFM valley cover (w/ connector) but it wasn't plugged in to the wiring harness.**