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ATK Engines:ATK Engines
Engine Size:371 cu. in.
Type:Crate Engines
Manufacturer Part Number:HP109
California Prop 65 Warning:True
Performance upgrade for LS based vehicles, Perfect for a 2001-2007 Chevy Truck LQ4 or LS swap in a hot rod, Big mid to upper end power, Noticeable idle, 505 Horsepower, 480 Lbs/Ft. Torque ATK Engines HP109 Chevy LQ4 6.0L Base Engine, 505HP Sku # 35020005 Mfr. Part # HP109 Condition New Brand ATK Engines Sold Each Details Info This engine was designed to be a performance upgrade for LS based vehicles or perfect for a 2001-2007 Chevy Truck LQ4 or LS swap in a hot rod. Expect big mid to upper end power, will have a noticeable idle. For optimal Performance you will need headers, chassis dyno tune and 36lb injectors. Engine Specifications: • HP: 505 • TQ: 480 • Block: OE LQ4/6.0L Iron • Bore/Stroke: up to 4.040” x 3.622” • Displacement (cu.in): up to 371 • Crankshaft: OE GM 24 tooth reluctor wheel • Rods: OE powder metal or Stock GM • Pistons: Hypereutectic 10:1 compression • Rings: Moly • Camshaft: Hyd. Roller • Cam Specs: Custom performance grind • Timing Chain: OE single roller • Cylinder Heads: OE cathedral port aluminum 71cc/210cc 2.00/1.55 • Rocker Arms: 1.7 Ratio • Oil Pump: Melling STD Volume Recommended Components: • Flexplate/Flywheel: Stock internally balanced • Balancer: Stock internally balanced/per application • Intake Manifold: Stock EFI intake or Aftermarket • Water Pump: Per application • Fuel Pump: Stock electric • Fuel Injectors: 36lb injectors • Spark Plugs: NGK #3186 • Spark Plug Wires: Factory Engine Info: • Oil: Conventional / Non Synthetic 10W30 • Oil Filter: Wix or K&N • Timing: Set to factory specifications via PCM module (ECM TUNING REQUIRED). • Spark Plug Gap: .040” • Firing Order: 18726543 • Octane: 91+ • Stall Converter: 1800+ • Exhaust: 1 5/8 + Headers (Per application – Larger diameter will make more power) Notes: This engine replaces the 2001-2007 Chevy 6.0L LQ4 engine. ECM MUST BE TUNED, not doing so can damage the engine. A PCV valve must be ran. You must also run an Air-Oil separator system such as the Moroso #85487 to capture the excess crankcase vapors LS engines are known for. If you are not running a MAP Sensor, the MAP timing option in the timing control box must be zeroed out all the way across. Failure to do so will allow the controller to add timing which can lead to detonation. You must also run some sort of a steam line kit that dumps to your water pump, radiator or radiator hose; we recommend a 4 corner setup like the Trick Flow #TFS-306SB601. This allows air pockets/hot spots to escape the heads and can also be used to purge out trapped air when filling the radiator for the first time. 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: 505 Torque: 480 Block: GM 6.0L Iron LQ4 Bore/Stroke: Up to 4.040 x 3.622 Year Range: 2001-2007 Displacement: Up to 371 C.I.D. Crankshaft: OEM GM 3.622″ Stroke Internally Balanced 24 tooth Reluctor wheel Connecting Rods: OE GM Powder Metal 6.093″ Stock Bolts Pistons: Hypereutectic Flat Top Piston Rings: Moly Rings Compression Ratio: 10:1 Compression Camshaft: Hydraulic Roller Camshaft Specifications: Custom Grind Camshaft Bearings: Installed & Clocked to OEM Position Cylinder Heads: OE Aluminum Cathedral Port 71cc/210cc 2.00/1.55 Freeze Plugs: Brass Installed & Sealed Rocker Arms: OE Powdered Metal 1.7 Ratio Oil Galley Plugs: Installed & Sealed Weight: 412 Installation Tips Oil : 10W30 Oil Filter: Wix or K&N Recommended Per Your Application Fuel Delivery : OE EFI System With Tune Intake Manifold : Stock EFI Manifold, Aftermarket or Edelbrock Carb Conversion #2908 Fuel Injectors : Stock Injectors or 36lb for optimal Performance Spark Plugs : NGK #3186 Spark Plug Gap : .040″ Harmonic Balancer/Damper : Stock Factory Balancer Internally Balanced Flex Plate / Flywheel : Stock Internally Balanced Tuning : MUST have Tune/Preferably Chassis Dyno Tune Timing : Set To Factory Specifications Via PCM Module (Tune Required) Water Pump : Per Application Firing Order : 1 8 7 2 6 5 4 3 Exhuast : 1 5/8 Headers / larger primary the better (per application) Fuel Pump : Stock Fuel : 91+ Octane Ignition : Coil Packs Automatic Transmission Stall Converter : 2500+ Specs Sold in Quantity Each Cylinder Head Style Assembled Piston Style Flat Top Piston Material Hypereutectic Aluminum Cylinder Head Material Aluminum Connecting Rod Material Powdered Metal Engine Balance Internal Rocker Arm Ratio 1.7 Camshaft Included Yes Intake Manifold Included No Valve Covers Included No Assembled Yes Cylinder Heads Included Yes Carburetor Included No Throttle Body Included No Distributor Included No Oil Pan Included No Timing Cover Included No Water Pump Included No Harmonic Balancer Included No Flexplate Included No Flywheel Included No Air Cleaner Included No Spark Plugs Included No Spark Plug Wires Included No Computer Included No Wiring Harness Included No Camshaft Type Hydraulic Roller Internally Balanced Yes Compression Ratio 10.0:1 Block 6.0LS Cast Iron Recommended Fuel 91-93 Octane MFG. Part # HP109 Engine Displacement 371 Horsepower 505 Torque 480 ft./lbs. GTIN Code 653517631504 Tech Support We’re here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through eBay Messaging and a knowledgeable Speedway Motors team member will be happy to help. About Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 72 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.
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