ATK Engines HPLH6N LS Crate 5.3L Engine, 475HP/435TQ

ATK Engines HPLH6N – 5.3L 475 HP / 435 TQ LS GEN IV 24x Crate Engine

Buy the ATK Engines HPLH6N 475 HP 5.3L LS crate engine – the limited-production all-aluminum powerhouse that delivers serious performance at an unbeatable price. This dyno-proven 323 ci GEN IV 24x LS produces 475 horsepower and 435 ft-lbs of torque right out of the box thanks to a factory camshaft upgrade and extra-thick cylinder sleeves for added strength and reliability.

Built on a brand-new GM aluminum 5.3L block, this deluxe crate engine is internally balanced and ready for drop-in installation in your next swap or rebuild project. Every unit ships with proof of performance and is backed by ATK’s trusted manufacturer warranty.

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Alt text: ATK Engines HPLH6N 475 HP 5.3L LS GEN IV crate engine – new aluminum block ready for swap

Key Specifications Table

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Alt text: ATK Engines HPLH6N dyno graph showing 475 HP and 435 ft-lbs torque

What’s Included – Deluxe Crate Engine (Drop-In Ready)

Complete long-block style crate with front dress kit. Excludes: Intake manifold, carburetor or EFI system, ECU/harness, flexplate/flywheel, and exhaust manifolds (add your choice for complete turnkey setup).

Why Builders Choose the ATK Engines HPLH6N

ATK High Performance has built a rock-solid reputation for delivering dependable LS power at real-world prices (see the full lineup on the official ATK High Performance website). This HPLH6N model starts with a fresh GM aluminum block and adds a performance cam upgrade plus reinforced sleeves so it handles daily driving, towing, or weekend track abuse without worry. At Hammer Engines we’ve installed dozens of these exact 475 HP 5.3L LS crate engines worldwide — customers love the instant power, lightweight aluminum construction, and bulletproof reliability that makes it one of the best values in our LS engines for sale category.

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Alt text: ATK Engines HPLH6N new GM 5.3L aluminum block with extra-thick cylinder sleeves

Perfect Applications

This budget-friendly 5.3L LS crate engine is the go-to choice for:

• Classic truck and C10 squarebody LS swaps (full details in our C10 LS swap guide)
• Silverado, Tahoe, and modern truck upgrades for better towing and MPG
• Fox-body Mustang and entry-level muscle car builds
• Jeep Wrangler and off-road rigs needing lightweight power
• Daily-driver street builds or mild street/strip projects
• Budget-conscious hot rods and pro-touring restorations

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Alt text: ATK Engines HPLH6N 475 HP 5.3L LS crate engine installed in classic squarebody C10 truck

Frequently Asked Questions (FAQ)

Is the HPLH6N a complete turnkey engine? No — it’s a deluxe dressed crate. Add your preferred intake, EFI/carb, and ECU for a full running setup.

What controller or fuel system works best? Holley Terminator X, PSI, or GM ECM — we stock complete plug-and-play kits.

Can it handle boost or nitrous? Yes — the extra-thick sleeves and 9.9:1 compression support mild boost or spray safely for 550–600+ HP.

Shipping & Warranty? Worldwide door-to-door from Hammer Engines with full ATK 3-year/unlimited-mile warranty.

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Alt text: ATK Engines HPLH6N deluxe crate engine with included front dress kit and oil pan

Related Blog Topics for Topical Authority (Naturally Link These)

1. ATK Engines HPLH6N Review: 475 HP 5.3L LS Crate Real-World Test
2. 5.3L vs 6.0L LS Crate Engine – Which One Should You Buy?
3. Budget C10 LS Swap Guide Using the ATK HPLH6N
4. How to Add Boost to an ATK 5.3L LS Engine (Turbo & Nitrous Safe Limits)
5. LS Engine Break-In & Maintenance for 200,000+ Mile Longevity
6. Best Transmissions for 475 HP 5.3L LS Crate Engines (4L60E vs 4L80E)