ATK High Performance Chevy LM7 5.3L 385 HP Long BLock Crate Engines HP97

Buy ATK High Performance Chevy LM7 5.3L 385 HP Long BLock Online

The ATK High Performance Chevy LM7 5.3L 385 HP Long Block (Part Number HP97) is a hand-built crate engine engineered to turn your truck, SUV, or LS swap project into a reliable powerhouse. Built on a durable iron block, this remanufactured 5.3L Gen III small-block Chevy delivers an impressive 385 horsepower and 380 lb-ft of torque. Every engine lm7 crate engine is precision-machined, balanced, and blueprinted by ATK to ensure long-lasting street and off-road performance.

Equipped with aluminum cathedral-port cylinder heads, a custom hydraulic roller camshaft, hypereutectic pistons, and a nodular iron crankshaft, the ATK High Performance Chevy LM7 5.3L 385 HP Long Block provides crisp throttle lm7 crate motor response and a muscular exhaust tone. Designed for straightforward bolt-in compatibility, this long-block sbf crate motor assembly includes the block, heads, valvetrain, timing assembly, and oil pump, allowing you to transfer lm7 for sale your existing intake manifold, fuel system, and accessories.

Whether restoring a classic GM truck or executing an aftermarket LS engine swap, this crate motor offers modern reliability and street-proven muscle.

Product Specifications & Key Benefits

• Engine Type: GM / Chevy Gen III Small Block V8 (LM7)

• Displacement: 5.3 Liters / 325 CID

• Horsepower Rating: ~385 HP

• Torque Rating: ~380 lb-ft

• Engine Block Material: Cast Iron (Standard 2-Bolt Main)

• Cylinder Heads: Aluminum Cathedral Port

• Bore x Stroke: 3.780″ x 3.270″

• Crankshaft: Nodular Iron

• Connecting Rods: Stock Heavy-Duty Forged Powdered Metal

• Pistons: Hypereutectic Aluminum

• Camshaft Type: Custom Hydraulic Roller

• Compression Ratio: ~9.5:1 to 9.7:1

• Valvetrain: Overhead Valve (2 valves per cylinder), Roller Rocker Assemblies

• Recommended Fuel: 91+ Octane Premium Unleaded

• Assembly Type: Long Block (Includes block, rotating assembly, camshaft, timing set, oil pump, cylinder heads, and valvetrain)

Key Product Benefits

• Proven Street & Off-Road Power: Delivering an impressive 385 HP and 380 lb-ft of torque, this long block significantly upgrades performance over factory 5.3L LM7 engines without compromising daily drivability.

• Precision Built & Blueprinted: Every engine is hand-assembled by ATK technicians using strict tolerances, hand-honed cylinders, and digitally balanced rotating assemblies for enhanced engine longevity and smooth operation.

• Durable Iron Block Foundation: Utilizes a rugged cast-iron GM LM7 block capable of handling increased thermal loads, making it ideal for heavy trucks, towing, or demanding LS swaps.

• Cost-Effective LS Swap Solution: Retains standard Gen III mounting points and sensor locations, allowing straightforward drop-in installation into original GM truck/SUV chassis or custom retrofits.

• Flexible Accessory Matching: As a long block, it lets you reuse or customize your existing intake manifold, fuel injection system, exhaust headers, and front pulley systems, keeping build costs controlled.

What components are included with the ATK High Performance Chevy LM7 5.3L 385 HP Long Block?

As a long block, it includes the engine block, crankshaft, connecting rods, pistons, camshaft, timing components, oil pump, cylinder heads, and valvetrain (rocker arms and pushrods). External accessories such as the intake manifold, fuel injectors, throttle body, ignition coils, oil pan, and front pulley system are not included and must be transferred or purchased separately.

What fuel octane and tuning are required for the ATK High Performance Chevy LM7 5.3L 385 HP Long Block?

Due to the upgraded performance camshaft and increased horsepower output, running premium pump gas (91+ octane) is recommended. Additionally, custom ECU tuning or recalibration is required to optimize fuel delivery and spark timing for smooth idling and peak power.