LQ4 6.0L LS3 HEADS 535HP

Engine Specifications:
* HP: 535
* TQ: 485
* Block: OE LQ4/LQ9 6.0L Iron
* Bore/Stroke: 4.030 x 3.622
* Displacement (cu.in): 371ci
* Crankshaft: OE GM 24 tooth reluctor wheel
* Rods: OE powder metal
* Pistons: Hypereutectic 10.1 compression
* Rings: Moly
* Camshaft: Hyd. Roller
* Cam Specs: Custom performance grind
* Timing Chain: OE single roller
* Cylinder Heads: ATK LS3 rectangle port aluminum 69cc/255cc 2.160”/1.600”ex
* Rocker Arms: OE 1.7 ratio with trunnion upgrade
* Oil Pump: Melling M295

Recommended Components:
* Flexplate/Flywheel: Stock internally balanced
* Balancer: Stock internally balanced/per application
* Intake Manifold: Stock rectangular port LS3 style EFI intake or aftermarket
* Water Pump: Per application
* Fuel Pump: Stock electric
* Fuel Injectors: 42lb injectors
* Spark Plugs: Autolite #104
* Spark Plug Wires: Factory or Aftermarket

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: 2500+
* Exhaust: 1 5/8+ Headers

Notes: This engine can replace the 2001-2007 Chevy 4.8/5.3/6.0L engines with proper upgrades including LS3 style intake. ECM MUST BE TUNED and injectors must be upgraded; not doing so can damage the engine. Power ratings will fluctuate based on induction system used (Carb/EFI & manifold design).

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 other aftermarket parts. ATK reserves the right to substitute parts used in engines if necessary.