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 305 lb·ft, depending on the model year and application. LR4s are manufactured at St. Catharines, Ontario and Romulus, Michigan.
This 4.8 liter V8 truck engine is a de-bored and de-stroked cast-iron block version of the small-block LS1 from the Corvette! The Vortec 4800, or LR4, has aluminum cylinder heads and a new, more powerful electronic throttle control computer. The 4800 utilizes the same block and cylinder heads as the Vortec 5300. The detailed engine specifications and the vehicles where the 4800 is mounted can be seen below.
Displacement: 4.8 L (4807 cc, 293 ci)
Horsepower: 285 (212 kW) @ 5200 rpm
Torque: 295 ft lbf (398 Nm) @ 4000 rpm
Bore: 3.78 in (96 mm)
Stroke: 3.27 in (83 mm)
Valve Configuration: Overhead
Ignition System: Direct, Coil-near-Plug
Lifters: Hydraulic Roller
Cam Drive: Chain
Valves per cylinder: Two 2003-present.
- 1999-2007 Chevrolet Silverado/GMC Sierra
- 1999-2006 Chevrolet Tahoe/GMC Yukon
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