From 1998 to 2007, the American company produced the 4.8-liter V8 GM LR4 engine, which was mounted on the Chevrolet Tahoe SUV in the rear of the GMT 800 and the Yukon. Additionally, Silverado and Sierra pickups, as well as Express and Savana minibuses, were equipped with this engine.
LR4, LM7, LY2, LY5, LFA, L92, and L86 are the Vortec line.
Specifications
| Production years | 1998-2007 |
| Displacement, cc | 4806 |
| Fuel system | distributed injection |
| Power output, hp | 255 – 285 |
| Torque output, Nm | 385 – 400 |
| Cylinder block | cast iron V8 |
| Block head | aluminum 16v |
| Cylinder bore, mm | 96 |
| Piston stroke, mm | 83 |
| Compression ratio | 9.4 |
| Features | OHV |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 5.7 |
| Fuel type | petrol |
| Euro standards | EURO 2 |
| Fuel consumption, L/100 km (for Chevrolet Tahoe 2003) — city — highway — combined |
17.7 9.9 12.8 |
| Engine lifespan, km | ~450 000 |
The engine was installed on:
- Chevrolet Express 2 (GMT610) in 2003 – 2006;
- Chevrolet Silverado 1 (GMT800) in 1998 – 2007;
- Chevrolet Tahoe 2 (GMT820) in 1999 – 2006;
- GMC Savana 2 (GMT610) in 2003 – 2006;
- GMC Sierra 2 (GMT800) in 1998 – 2007;
- GMC Yukon 2 (GMT820) in 1999 – 2006.
Disadvantages of the GM LR4 engine
The water pump’s condition and the radiators’ cleanliness are crucial for trouble-free engine operation;
Overheating causes plastic t-shirts to burst, and lubricant and antifreeze leaks occur;
Additionally, using inferior oils causes the camshaft liners to wear down quickly;
The unit’s adsorber, gasoline pump, and ignition coils are also weak points.