Vehicle Applications

• 2005–2007 Chevrolet Silverado 1500 Extended Cab 4wd
• 2005–2007 GMC Sierra1500 Extended Cab 4wd

Product Highlights

• Gen III Aluminum Cylinder Block
• Cathedral Port Aluminum Cylinder Heads
• Drive By Wire (Electronic Throttle) 
• 24X Ignition Systems

L33 Engine Specs (VIN "B")

The information listed here is for the stock engine.

Performance Specifications
Compression Ratio	9.9:1
Horsepower Rating	310 hp.
Torque Rating	335 ft./lbs.

 

Application Information
VIN 8th Digit	Year	Make	Model
B	2005-2007	Chevrolet	Silverado 1500, extended cab, 4WD
		GMC	Sierra 1500, extended cab, 4WD

 

Engine Block Specifications
Casting Numbers	12567392
Material	Aluminum
Displacement	5.3L / 325 cid
Bore Dia.	3.780 in.
Stroke	3.622 in.
Deck Height	9.240 in.
Bore Spacing	4.400 in.
Thrust Bearing Location	#3 Main
Main Cap Style	6-Bolt
Main Housing Bore Diameter	2.751 in.
Cam Housing Bore Diameter	Bore 1/5 = 2.346, Bore 2/4 = 2.326, Bore 3 = 2.307
Cam-to-Crank Centerline	4.914 in.

 

Rotating Assembly Specifications
Piston Material	Hypereutectic Cast Aluminum Alloy
Piston Style	Flat Top
Piston Volume	0cc
Wrist Pin Dia. (2005)	0.9429 in., 0.9431 in (Floating)
Connecting Rod Material	Powdered Metal
Connecting Rod Style	I-Beam
Connecting Rod Length	6.098 in.
Connecting Rod Bolts	M9 x 1 x 43
Crankshaft Material	Cast Iron
Crankshaft Main Journal	2.559 in.
Crankshaft Rod Journal	2.100 in.
Reluctor Wheel	24x

 

Cylinder Head Specifications
Casting Numbers	799, 243
Material	Aluminum
Combustion Chamber Volume	65cc
Intake Port Shape	Cathedral
Intake Runner Volume	210cc
Exhaust Port Shape	D Port
Exhaust Runner Volume	75cc
Intake Valve Diameter	2.000 in.
Exhaust Valve Diameter	1.550 in.
Cylinder Head Bolt Style	Torque to Yield (TTY)
Cylinder Head Bolt Size	(10) M11 x 2 x 100, (5) M8 x 1.25 x 45

 

Camshaft Specifications
Duration at .050 in (int./exh)	193/193
Valve Lift (int./exh)	0.482 in./0.482 in.
Lobe Separation Angle (in degrees)	116
Cam Gear Attachment	3-Bolt

 

Valvetrain Specifications
Lifter Style	Hydraulic Roller
Lifter Link Style	Plastic Lifter Tray
Lifter Body Diameter	0.842 in.
Pushrod Length	7.385 in.
Rocker Arm Mounting Style	Pedestal
Rocker Arm Style	Die-Cast, Roller Fulcrum
Rocker Ratio	1.7
Rocker Offset	None
Valve Spring Style	Beehive
Valve Spring Color	Natural
Valve Angle	15 Degrees
Intake Valve Material	Steel - Solid Stem
Intake Valve Dia.	2.000 in.
Exhaust Valve Material	Steel - Solid Stem
Exhaust Valve Dia.	1.550 in.

 

Other Specifications
Intake Manifold	Truck Style
Throttle Body	78mm, 3-Bolt
Throttle Control	Drive-by-Wire
Fuel Injector Flow	25.2 lb/hr @ 58 psi
Fuel Injector Length (between O-Rings)	1.900 in.
Fuel Injector Connector	Mini-Delphi / Multec2
Fuel Rail	Returnless
PCM	Warren
Crankshaft Reluctor Ring	24x
Camshaft Sensor	Rear Mount, 1x on cam
Oil Pan	Rear deep sump
Oil Pump	Standard Volume