ATK HP116-G4 Chevy LM7 GEN IV 5.3L Base Engine 500HP

Description

Engine Specifications:
• HP: 500
• TQ: 440
• Block: OE LM7/5.3L Iron
• Bore/Stroke: up to 3.903” x 3.622
• Displacement (cu.in): up to 347ci
• Crankshaft: OE GM 58 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: AFR CNC ported aluminum 59cc/200cc 2.000”in/1.570”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 EFI intake or aftermarket
• Water Pump: Per application
• Fuel Pump: Stock electric
• Fuel Injectors: 36lb 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: 2200+
• Exhaust: 1 5/8+ Headers

Notes: This engine can replace the Gen IV Chevy 4.8/5.3/6.0L engines with proper upgrades. ECM MUST BE TUNED and injectors must be upgraded; not doing so can damage the engine.

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.