GM / Chevy LY5 Vortec 5300

GM / Chevy LY5The GM / Chevy LY5 is a 5.3 l (325 natural aspirated V8 90° four-stroke gasoline engine from a Generation IV small block V8 truck engine series. The engine was produced from 2007 to 2009.

The GM LY5 Vortec 5300 features a V8 90° cast-iron cylinder block with a five-bearings crankshaft, two aluminum heads, a single one-piece cast camshaft, and two valves per cylinder (16 in total). The LY5 has a sequential multi-port fuel injection system with an active fuel management system and an 87.0 mm throttle body. The engine used a “Coil-Near-Plugs” ignition system.

The compression ratio rating is 9.9:1. Cylinder bore and piston stroke are 96.0 mm (3.78 in) and 92.0 mm (3.62 in), respectively. The engine produced from 320 PS (235 kW; 315 HP) at 5,200 rpm to 325 PS (239 kW; 320.5 HP) at 5,200 rpm. The engine has a torque rating between 454 N·m (46.3 kg·m, 334.6 ft·lb) at 4,000 rpm and 461 N·m (47 kg·m, 339.8 ft·lb) at 4,000 rpm.

General information

Engine Specifications
Engine codeGM / Chevy LY5 Vortec 5300
LayoutFour stroke, V8
Fuel typeGasoline (petrol)
Displacement5.3 L, (325 cu in)
Fuel systemSequential multi-port fuel injection
Power adderNone
Power output From 320 PS (235 kW; 315 HP) at 5,200 rpm
to 325 PS (239 kW; 320 HP) at 5,200 rpm
Torque output From 454 N·m (46.3 kg·m, 334.6 ft·lb) at 4,000 rpm
to 461 N·m (47 kg·m, 339.8 ft·lb) at 4,000 rpm
Firing order1-8-7-2-6-5-4-3
Active fuel management system1-4-6-7
Dimensions (L x W x H):

Cylinder block

The GM LY5 has a cast-iron cylinder block with a five-bearings crankshaft supported system. The crankshaft journal diameter is 65.0 mm (2.55 in), the crankpin diameter is 53.3 mm (2.09 in).

The cylinder bore is 96.0 mm (3.78 in), piston stroke is 92.0 mm (3.62 in) and the compression ratio rating is 9.9:1. The GM LY5 motor has two compression and one oil control rings.

Cylinder block
Cylinder block alloyCast-iron
Compression ratio:9.9:1
Cylinder bore:96.0 mm (3.78 in)
Piston stroke:92.0 mm (3.62 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:5
Cylinder inner diameter (standard):96.000-96.018 mm (3.7795-3.7802 in)
Piston skirt diameter (standard):96.000 mm (3.7795 in)
Piston pin outer diameter:23.952-23.955 mm (0.943-0.9431 in)
Piston ring side clearance:Top0.040-0.085 mm (0.0016-0.0033 in)
Second0.040-0.078 mm (0.0016-0.0031 in)
Oil0.012-0.200 mm (0.0005-0.0079 in)
Piston ring end gap:Top0.23-0.44 mm (0.0091-0.0173 in)
Second0.44-0.70 mm (0.0173-0.0276 in)
Oil0.18-0.75 mm (0.0071-0.0295 in)
Connecting rod small end diameter24.000 mm (0.9449 in)
Connecting rod big end diameter:56.505-56.525 mm (2.2246-2.2254 in)
Crankshaft main journal diameter:64.993-65.007 mm (2.5588-2.5593 in)
Crankpin diameter:53.318-53.338 mm (2.0991-2.0999 in)

Cylinder head

The cylinder heads are made of strong, light aluminum alloy which gives it good cooling efficiency. The LY5 uses 243/799 cylinder heads. The camshaft is driven by a single chain. The timing chain transmits the rotational movement from the crankshaft to the camshafts. Valves are operated via pedestal mounting rocker arms.

Cylinder head
Block head alloyAluminium
Valve Arrangement:OHV, chain drive
Cylinder head height:
Valves:16 (2 valves per cylinder)
Intake valve timing:
Exhaust valve timing:
Valve head diameter:INTAKE
Valve length:INTAKE
Valve stem diameter:INTAKE7.955-7.976 mm (0.3132-0.314 in)
EXHAUST7.955-7.976 mm (0.3132-0.314 in)
Valve spring free length:INTAKE52.9 mm (2.0827 in)
EXHAUST52.9 mm (2.0827 in)
Camshaft lobe lift:INTAKE Non active fuel managment cylinders: 7.20 mm (0.2835 in)
Active fuel managment cylinders: 7.33 mm (0.2886 in)
EXHAUST Non active fuel managment cylinders: 7.20 mm (0.2835 in)
Active fuel managment cylinders: 7.33 mm (0.2886 in)
Camshaft journal diameter:54.99-55.04 mm (2.165-2.1669 in)

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°

Maintenance data

Compression pressure
Standard12.5 kg/m2 / 300 rpm
Minimun7.0 kg/m2 / 300 rpm
Compression differential limit between cylinders1.0 kg/m2 (15 psi) / 300 rpm
Oil system
Oil consumption , L/1000 km (qt. per miles)up to 0.5 (1 qt. per 1200 miles)
Recommended engine oil 5W-30, 10W-30
Oil typeGM Standard GM6094M
Engine oil capacity (Refill 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 change interval, km (miles)12,000 km (7,500 miles)
Oil Pressure 41 kPa at 1,000 rpm
124 kPa at 2,000 rpm
165 kPa at 4,000 rpm
Ignition system
Spark plugAC Delco: 41-985 Iridium
Spark plug gap1.01 mm (0.0398 in)

Vehicle applications

ModelYears Produced
Chevrolet Avalanche2007-2009
Chevrolet Silverado 15002007-2009
Chevrolet Suburban2007–2009
Chevrolet Tahoe2007–2009
GMC Sierra 15002007–2009
GMC Yukon2007–2009
GMC Yukon XL2007–2009
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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