GM / Chevy LY2 Vortec 4800

LY2 Vortec 4800GM / Chevy LY2 VORTEC 4800 is a 4.8 L (4807 cc, 293.34 cu·in) natural aspirated V8 90° four-stroke liquid-cooled internal combustion gasoline engine, manufactured by General Motors from 2007 to 2009. The LY2 (VIN code “C”) is the smallest engine of the Generation IV Vortec truck engines.

The cylinder bore is 96.1 mm (3.78 in) and the piston stroke is 83.0 mm (3.27 in). The compression ratio rating is 9.1:1. This engine produced from 264 PS (194 kW; 260 HP) to 300 PS (220 kW; 295 HP) of horsepower and from 400 N·m (40.8 kg·m, 294.8 ft·lb) to 414 N·m (42.2 kg·m, 305.1 ft·lb) of torque.

The GM LY2 features:

  • OHV design with 2 valves per cylinder (16 in total)
  • Cast-iron cylinder block with five main bearings
  • Aluminum cilinder heads
  • Cast aluminum pistons
  • Powdered metal connecting rods
  • Throttle body 84.0 mm (3.31 in) with electronic (Drive-by-Wire) control
  • Cast nodular iron crankshaft
  • Coil-Near-Plug ignition system
  • Sequential Fuel Injection (SFI)

General information

Engine Specifications
Engine model GM / Chevy LY2 Vortec 4800
Production 2007-2009
Engine type 4-stroke, V8, OHV, chain driven
Displacement 4.8 L, 4,807 cm3, (293 CID)
Max. horsepower From 264 PS (194 kW; 260 HP)
to 300 PS (220 kW; 295 HP)
Max. torque From 400 N·m (40.8 kg·m, 294.8 ft·lb)
to 414 N·m (42.2 kg·m, 305.1 ft·lb)
Ignition system Coil-Near-Plugs
Fuel system Sequential fuel injection (SFI)
Power adder None
Firing order 1-8-7-2-6-5-4-3
Cooling system Liquid-cooled
Lubricating system Wet sump

Cylinder Block and Head

Cylinder block
Cylinder block alloy: Cast-iron
Compression ratio: 9.1:1
Cylinder bore: 96.1 mm (3.78 in)
Piston stroke: 83.0 mm (3.27 in)
Cylinder internal diameter (standard): 96.000-96.018 mm (3.7795-3.7802 in)
Number of piston rings (compression / oil): 2/1
Connecting rod big end diameter (standard): 56.505-56.525 mm (2.2246-2.2254 in)
Piston pin diameter: 23.952-23.955 mm (0.943-0.9431 in)
Side clearance (Top): 0.040-0.085 mm (0.0016-0.0033 in)
Side clearance (Second): 0.040-0.078 mm (0.0016-0.0031 in)
Side clearance (Oil): 0.012-0.200 mm (0.0005-0.0079 in)
Ring end gap (Top): 0.230-0.440 mm (0.0091-0.0173 in)
Ring end gap (Second): 0.440-0.700 mm (0.0173-0.0276 in)
Ring end gap (Oil): 0.180-0.750 mm (0.0071-0.0295 in)
Number of main bearings: 5
Crankshaft main journal diameter: 64.992-65.008 mm (2.5587-2.5594 in)
Crankpin journal diameter: 53.318-53.338 mm (2.0991-2.0999 in)
Crankshaft center distance: 41.5 mm (1.635 in)
Cylinder head
Cylinder head alloy: Aluminum
Valve arrangement: OHV, chain driven
Valves: 2,(16 valves in total)
Valve steam diameter (INTAKE): 7.955-7.976 mm (0.3132-0.314 in)
Valve steam diameter (EXHAUST): 7.955-7.976 mm (0.3132-0.314 in)
Valve spring free length (INTAKE): 52.9 mm (2.0827 in)
Valve spring free length (EXHAUST): 52.9 mm (2.0827 in)
Camshaft lobe height (INTAKE): 7.2 mm (0.2835 in)
Camshaft lobe height (EXHAUST): 7.2 mm (0.2835 in)
Camshaft journal diameter : 54.990-55.040 mm (2.165-2.1669 in)

Head tightening torque

Head tightening procedure and torque specs
M8 bolts: 30 Nm (3.06 kg·m; 22.14 ft·lb)
M11 bolts: Step 1: 30 Nm (3.06 kg·m; 22.14 ft·lb)
Step 2: Turn all bolts: 90°
Step 3: Turn all bolts: 70°

Service Data

Oil system
Lubrication system: Pressurized lubrication
Oil type:
Recommended oil: 5W-30, 10W-30
Oil capacity: Without oil filter: 5.2 L (5.5 US. qt, 4.6 Imp. qt.)
With oil filter: 5.7 L (6.0 US. qt, 5.00 Imp. qt.)
Oil pressure: 41 kPa (5.9 psi) at 1000 rpm
124 kPa (18 psi) at 2,000 rpm
165 kPa (23.9 psi) at 4,000 rpm
Ignition system
Type: Coil-Near-Plug
Spark plug: AC Delco 41-985
Spark plug gap: 1.01 mm (0.0398 in)
Spark plug torque: 15 N·m (1.5 kg·m, 11.1 ft·lb)

Applications

Model Years Produced
Chevrolet Express 2008–2009
Chevrolet Silverado 2007–2009
Chevrolet Tahoe 2007–2009
GMC Sierra 2007–2009
GMC Yukon 2007–2009
GMC Savana 2008–2009

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