Engine Specifications:
• HP: 475
• TQ: 430
• Block: New GM 5.3L Aluminum
• Bore/Stroke: 3.780”x 3.622
• Displacement (cu.in): 323
• Crankshaft: OEM GM 24 tooth reluctor wheel
• Rods: Stock GM
• Pistons: Hypereutectic Flat Top 9.9:1 compression
• Rings: Moly
• Camshaft: Hyd. roller
• Cam Specs: 223/231 @50 .610/.617 112LSA COMP CAM #54-457-11
• Cylinder Heads: OE 799 or 243 aluminum 65cc 2.000”/1.575” valves
• Rocker Arms: OE powdered metal 1.7 ratio
Recommended Components:
• Oil- 5W30
• Fuel System – OE EFI System
• Intake – Stock Fuel Injected or Aftermarket
• Balancer- Stock Internally Balanced
• Flex plate/Flywheel- Stock Internally Balanced
• Spark Plug- Stock
• Spark Plug Gap- .035”
• Timing- Set to Factory Specifications Via PCM Module (Tune Required)
• Firing Order- Stock
• Fuel – 91 Octane
• Recommended Stall Converter- 2200+ based on application
• Headers- 1 7/8” depending on application
Notes: This engine is a brand new GM 5.3L that GM built for 2005-2009 Trucks and SUV’s. ATK did a camshaft and valve spring upgrade along with AFM/DOD delete. For optimal Performance you will need headers, chassis dyno tune (required) and upgraded injectors. If you are using this as a swap for a vehicle mentioned above, the AFM/DOD will have to be turned off in the ECM. Power figures may vary depending on which induction system is used. Dyno figures are based on using a 750CFM carburetor and Vic Jr. intake manifold with 1 7/8 headers.
Disclaimer: The parts listed are ATK’s recommendations of parts to be used to obtain our power figures listed. Power figures can vary based on parts used by the end user. It is the customer’s responsibility to verify components will work in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts. . ATK reserves the right to substitute parts used in engines if necessary.
Specs
Horsepower: 475
Torque: 435 lb/ft
Block: GM 5.3L Aluminum LH6/LC9
Bore/Stroke: 3.780″ x 3.622″
Year Range: 2005-2009
Displacement: 323CI
Crankshaft: OEM GM 3.622″ Stroke Internally Balanced 24 tooth Reluctor wheel
Connecting Rods: OE GM
Pistons: Hypereutectic Flat Top
Piston Rings: Moly Rings
Compression Ratio: 9.9:1 Compression
Camshaft: Hydraulic Roller
Camshaft Specifications: 223/231 at .050 in .610/.617 lift with 112 LSA
Camshaft Bearings: Installed & Clocked to OEM Position
Cylinder Heads: OE 799/243 Aluminum 65cc 2.000″ / 1.575″ Valves
Freeze Plugs: Brass Installed & Sealed
Rocker Arms: OE Powdered Metal 1.7 Ratio
Oil Galley Plugs: Installed & Sealed
Weight: 412
*Dyno figures are based on using a 750CFM carburetor and Vic Jr. intake manifold with 1 7/8 headers. With an EFI system this will pick up power.
Warranties
This engine comes with a 2 year/unlimited mileage warranty to the original purchaser
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