The GM / Chevy L33 Vortec 5300 HO is a 5.3 L (5,328 cc, 325.13 cu·in) natural aspirated V8 small-block four-stroke liquid-cooled internal combustion gasoline engine, manufactured by General Motors. The GM L33 engine (VIN code “B”) is a lightweight version of the LM7, and it was available in Chevrolet Silverado 1500 (4WD) and GMC Sierra 1500 (4WD) from 2005 to 2007.
The GM / Chevy L33 engine has a V8 lightweight aluminum cast block, flat top pistons from the LR4 Vortek 4.8 L, two aluminum heads with 16 overhead valves (OHV) and a single camshaft. This engine used a sequential fuel injection system and “Coil-Near-Plugs” ignition system with a composite distributor and pressurized lubricating system with a wet sump. The engine is equipped with a returnless fuel rail and 78.0 mm electronic (Drive-by-Wire) throttle.
The L33 engine produces 313 PS (230 kW; 310 HP) at 5,200 rpm of maximum horsepower and 441 Nm (45 kg·m; 325 ft·lb) at 4,000 rpm of peak torque.
General information
| Engine Specifications | |
| Engine model | GM / Chevy L33 Vortec 5300 HO |
| Production | 2005-2007 |
| Engine type | 4-stroke, V8, OHV, chain driven |
| Displacement | 5.3 L (5,328 cm3, 325.13 cu·in) |
| Max. horsepower | 313 PS (230 kW; 310 HP) at 5,200 rpm |
| Max. torque | 441 Nm (45 kg·m; 325 ft·lb) at 4,000 rpm |
| Ignition system | Coil-Near-Plugs |
| Fuel system | Sequential fuel injection |
| Power adder | None |
| Firing order | 1-8-7-2-6-5-4-3 |
| Cooling system | Liquid-cooled |
| Lubricating system | Wet sump |
Cylinder Block
A 96.0 mm (3.78 in) cylinder bore and 92.0 mm (3.62 in) piston stroke give the L33 engine a total of 5.3 L (325 CID) of displacement. Compression ratio rating is 9.9:1. The engine used an aluminum cylinder block with iron cylinder sleeves and 11.76 mm (4.40 in) of bore spacing.
The Vortec 5.3 HO is equipped with flat top pistons which are made of cast aluminum alloy and powdered metal I-beam style connecting rods. The connecting rod’s length is 154.89 mm (6.098 in). Each piston is fitted with two compression rings and a single oil ring.
| Cylinder block | |
| Cylinder block alloy | Aluminium |
| Compression ratio: | 9.9:1 |
| Cylinder bore: | 96.0 mm (3.78 in) |
| Piston stroke: | 92.0 mm (3.62 in) |
| Cylinder internal diameter (standard): | 96.000-96.018 mm (3.7795-3.7802 in) |
| Piston skirt outer diameter (standard): | 96.000 mm (3.7795 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) |
| Connecting rod small end diameter (standard): | 24.000 mm (0.9449 in) |
| Piston pin diameter: | 23.950-23.957 mm (0.9429-0.9431 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: | 64.993-65.007 mm (2.5588-2.5593 in) |
| Crankpin journal diameter: | 53.318-53.338 mm (2.0991-2.0999 in) |
| Crankshaft center distance: | 46 mm (1.81 in) |
Cylinder Head
The GM / Chevy L33 engine has two aluminum heads with 2 valves per cylinder (16 in total) and a single camshaft driven by the crankshaft via a chain. The intake port has a cathedral shape with 210 cc intake runner volume and the exhaust has a “D” shape with 75 cc exhaust runner volume. Intake and exhaust valves are made of steel with a solid stem. Valves are operated via pedestal mounting rocker arms.
This engine uses a composite intake manifold and high silicon molybdenum cast nodular iron exhaust manifold.
| Cylinder head | |
| Cylinder head alloy | Aluminium |
| Valve arrangement: | OHV, chain driven |
| Valves:: | 2 (16 valves in total) |
| Intake timig: | 193° |
| Exhaust timig: | 193° |
| Valve lift (INTAKE): | 12.24 mm (0.482 in) |
| Valve lift (EXHAUST): | 12.24 mm (0.482 in) |
| Valve head diameter (INTAKE): | 50.8 mm (2.000 in) |
| Valve head diameter (EXHAUST): | 39.4 mm (1.5512 in) |
| Camshaft lobe lift (INTAKE): | 7.20 mm (0.283 in) |
| Camshaft lobe lift (EXHAUST): | 7.20 mm (0.283 in) |
| Lobe Separation Angle: | 116° |
Service Data
The engine oil with a viscosity of 5W-30 is recommended for the L33, refilling oil capacity is 5.7 L (6.02 US. qt, 5.02 Imp. qt.). A recommended spark plug is AC Delco 41-985 Iridium with 1.01 mm (0.0398 in) spark plug gap.
| Oil system | |
| Lubrication system: | Wet sump |
| Oil type: | 5W-30 |
| Oil capacity: | 5.7 L (6.02 US. qt, 5.02 Imp. qt.) |
| Oil change interval: | 12,000 km (7,500 miles) |
| Fuel system | |
| Type: | Sequential multi-port fuel injection |
| Fuel Injector Flow: | 3.180 gm/sec (25.2 lb/hr) at 58 psi |
| Ignition system | |
| Type: | Coil-Near-Plugs |
| Spark plug: | AC Delco 41-985 Iridium |
| Spark plug gap: | 1.01 mm (0.03980.0398 in) |
| Spark plug torque: | 15 N·m (1.5 kg·m, 11.1 ft·lb) |
Applications
| Model | Years Produced |
| Chevrolet Silverado 1500 (4WD) | 2005-2007 |
| GMC Sierra 1500 (4WD) | 2005-2007 |
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