The Vortec 4800 LR4 is one of the Generation III small block V8 truck engines. 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 LR4 produces 270 horsepower to 295 horsepower and 285 lb·ft to [...]