Buy ATK Engines HPLH6N LS Crate 5.3L Engine Online

The ATK Engines HPLH6N LS Crate 5.3L Engine is built for enthusiasts who want modern LS efficiency with serious naturally aspirated output. This limited-production GEN IV 24x crate engine delivers a dyno-tested 475 horsepower and 435 lb-ft of torque from 323 cubic inches, giving swaps and rebuilds a strong balance of quick revs, usable torque, and lightweight all-aluminum 5.3 ls crate engine construction. Built on a new GM 5.3L aluminum block with extra-thick cylinder sleeves, the 5.3 crate engine package uses a 9.9:1 compression ratio, hypereutectic flat-top 383 stroker engine pistons, powdered-metal rods, an OEM GM 24x crankshaft, and an upgraded hydraulic roller camshaft for reliable high-performance street use.

The ATK Engines HPLH6N LS Crate 5.3L Engine also includes key accessories such as a water pump, harmonic balancer, retrofit oil pan, timing cover, and valve covers, helping simplify installation for compatible projects. Whether you are planning an LS swap, replacing a 5.3 l crate engine tired engine, or building a responsive street machine, this crate engine offers proven power in a compact, affordable package. With dyno proof included and ATK warranty coverage, it gives builders added 5.3 hp confidence when choosing a fresh 5.3L foundation for trucks, muscle cars, swap projects, and custom performance builds needing lightweight packaging, strong naturally aspirated output, and LS aftermarket support.

Product Specifications

ATK Engines HPLH6N LS Crate 5.3L Engine

Engine family: LS GEN IV 24x crate engine.
Displacement: 5.3L / 323 cubic inches.
Power output: 475 horsepower, dyno tested.
Torque output: 435 lb-ft.
Compression ratio: 9.9:1.
Block: New GM 5.3L aluminum block with extra-thick cylinder sleeves.
Bore x stroke: 3.780 in. x 3.622 in.
Crankshaft: OEM GM 24x reluctor wheel crankshaft.
Pistons: Hypereutectic flat-top aluminum pistons.
Connecting rods: Powdered metal rods.
Camshaft: Upgraded GEN IV hydraulic roller camshaft.
Balance: Internally balanced.
Included accessories: Water pump, harmonic balancer, retrofit oil pan, timing cover, and valve covers.
Excluded items: Intake manifold, carburetor or EFI system, ECU/harness, flexplate or flywheel, and exhaust manifolds.
Recommended oil: 5W-30 synthetic.
Warranty: ATK 3-year / unlimited miles parts and labor warranty.

Product Benefits

Strong naturally aspirated LS performance: With 475 HP and 435 lb-ft, this 5.3L crate engine offers a major performance step up for swaps, rebuilds, and street-driven projects.
Lightweight aluminum construction: The new GM aluminum block helps reduce engine weight, which is attractive for builders looking for better balance and a more responsive setup.
Added durability for performance use: Extra-thick cylinder sleeves, an upgraded hydraulic roller cam, and an internally balanced assembly support strength and reliability in high-performance applications.
Simplifies installation planning: With the water pump, balancer, retrofit oil pan, timing cover, and valve covers already included, buyers have fewer major front-end components to source separately.
Good fit for LS swap projects: The product page positions this engine as a strong choice for swap and rebuild builds, making it appealing for classic trucks, muscle cars, and custom performance applications.
Confidence from dyno verification and warranty coverage: The listing states each engine ships with proof of performance and is backed by ATK warranty coverage, which adds buyer confidence before installation.

What is included with the ATK Engines HPLH6N LS Crate 5.3L Engine?

The ATK Engines HPLH6N LS Crate 5.3L Engine includes a water pump, harmonic balancer, retrofit oil pan, timing cover, and valve covers. The retailer states it does not include the intake manifold, carburetor or EFI system, ECU/harness, flexplate or flywheel, and exhaust manifolds.

What are the key performance specs of the ATK Engines HPLH6N LS Crate 5.3L Engine?

This engine is listed as a GEN IV 24x 5.3L LS crate engine producing 475 horsepower and 435 lb-ft of torque, with a 9.9:1 compression ratio, a new GM aluminum block, and extra-thick cylinder sleeves for added strength.