ATK HP97 Chevy LM7 5.3L 99-07 Truck Base Engine 385HP

Description

This engine was designed to be a performance upgrade for a 1999-2007 Chevy Truck LM7 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 upgraded injectors. Cam Specs will come with the engine.

Engine Specifications:
• HP: 385
• TQ: 390
• Block: Seasoned OE LM7/5.3L iron
• Bore/Stroke: Up to 3.809 x 3.622
• Displacement (cu.in): 323
• Crankshaft: OEM GM 24 tooth reluctor wheel
• Rods: Stock GM
• Pistons: Hypereutectic 9.5:1 compression
• Rings: Moly
• Camshaft: Hyd. roller
• Cam Specs: Custom performance grind
• Cylinder Heads: OE aluminum 61.15cc 1.89”/1.55” valves
• Rocker Arms: OE powdered metal 1.7 ratio

Recommended Components:
• Oil- 5W30
• Fuel System – OE EFI System
• Intake – Stock Fuel Injected
• 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- stock or 1800
• Exhaust- 1 5/8 or 1 3/4 Headers

Notes: This engine was designed to be a performance upgrade for a 1999-2007 Chevy Truck LM7 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 (required) and upgraded injectors. Cam Specs will come with 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.