The General Motors 60° V6 engine family is a series of 60° V6 engines produced for both longitudinal and transverse applications. All of these engines are 12-valve cam-in-block or overhead valve engines, except for the LQ1; which uses 24 valves driven by dual overhead cams. These engines vary in displacement between and have a cast-iron block and either cast-iron or aluminum heads. Production of these engines began in 1980 and ended in 2005 in the U.S., with production continued in China until 2010. This engine family was the basis for the GM High Value engine family. These engines have also been referred to as the X engines due to their first usage in the X-body cars. This engine is not related to the GMC V6 engine that was designed for commercial vehicle usage. This engine family was developed by Chevrolet although it was used by all of GM's divisions. Generation I The first generation of modern small GM 60° V6 engines featured an iron block and heads with inline valves. This "clean sheet" design was introduced in 1980 and versions were produced through 1995. Two different blocks with minor differences were developed: A transverse engine family for front-wheel drive A longitudinal engine family for rear-wheel drive Transverse The transverse engines began the 60° family in 1980. Like the rest of the Generation I engines, they were updated in 1985 with larger main journals for durability, along with multi-point fuel injection or E2SE carb and OBD I. Production of the Generation I transverse engines ended in 1986. LE2 The LE2 was the first version of the 60° engine. It was a transverse version produced from 1980 through 1986 for the A-body and X-body cars. The standard ("X-code") engine for this line, it used a two-barrel carburetor. Output was for 1980 and '81 for 1982-86 and . Bore was and stroke was . Applications: 1980–1985 Buick Skylark 1986 Buick Century 1986 Oldsmobile Cutlass Ciera & Cutlass Cruiser 1980–1984 Oldsmobile Omega 1980–1984 Pontiac Phoenix 1980–1985 Chevrolet Citation 1982–1986 Pontiac 6000 1982–1986 Chevrolet Celebrity LH7 Introduced in 1981, the LH7 was a High Output ("Z-code") version of the LE2 for the higher-performance X-cars like the Chevrolet Citation X-11 and higher-performance A-cars like the Pontiac 6000 STE. It retained a two-barrel carburetor and produced and for 1981 and for 1982-1984 versions. The LH7 was replaced after 1984 with the MFI L44. Applications: 1982–1984 Buick Skylark