ATK GM 489 Stroker 565 HP HP411PM Stage 2 Performance
ATK GM 489 Stroker 565 HP HP411PM Stage 2 Performance provides track-validated 565 HP performance featuring high-flow aluminum heads and a professional mid-dress assembly for aggressive street builds.
- Total Displacement: 8.0L / 489 CI volume.
- Performance Output: Reliable 565 Horsepower rating.
- Head Construction: Aluminum Head Material.
- Block Composition: Cast Iron Main Block.
- Valvetrain Style: Hydraulic roller OE cam.
ATK Performance Limited Warranty Included.
Description
ATK HP411PM 565 HP Mid-Dress Fitment Specs
ATK GM 489 Stroker 565 HP HP411PM Stage 2 Performance engines deliver an elite high-output big block powertrain solution for muscle car restomods and heavy-duty truck upgrades. This 8.0L 489ci stroker utilizes high-flow aluminum cylinder heads and a 10.0:1 compression ratio to produce a verified 565 horsepower. Built on a seasoned cast-iron block and precision-balanced for smooth high-RPM operation, this Big Block Chevy (BBC) foundation is a direct performance fit for classic GM platforms like the Chevelle, Impala, and Silverado requiring massive displacement.
Designed to accelerate the engine swap process, this mid-dressed rebuilt engine arrives with a pre-installed carbureted intake manifold, water pump, and distributor. While the ATK HP411PM provides essential induction mounting and timing components, builders must integrate their own carburetor and ignition wires to finalize the assembly. Supported by a professional 1-Year limited warranty, this unit is protected against fluid weeping by a modern one-piece rear main seal, ensuring long-term reliability for elite-level street machine projects.
Key Features of ATK High Performance HP411PM
- 8.0L 489ci stroker displacement delivering 565 horsepower performance.
- High-flow aluminum cylinder heads for maximum volumetric efficiency.
- Hydraulic roller camshaft optimizes valvetrain duration and torque.
- 10.0:1 compression ratio designed for aggressive street and strip use.
- Seasoned cast-iron block foundation for superior structural integrity.
- Internal engine balance ensures vibration-free power delivery.
- Backed by a professional 1-Year limited warranty.
HP411PM Include:
- Intake Manifold
- Distributor
- Oil Pan
- Valve Covers
- Timing Cover
- Water Pump
- Harmonic Balancer
- Flexplate
ATK High Performance HP411PM GM 489 Stroker 565 HP Stage 2 LB Specs
| Brand | ATK High Performance Engines |
| Engine Model | HP411PM |
| Part Type | Crate Engines |
| Product Line | ATK High Performance GM 489 Stroker 565 HP Stage 2 Long Block Crate Engines |
| Engine Type | HPE-HP411PM |
| UPC | 653517517846 |
| Crate Engine Family | Chevy Big Block |
| Engine Displacement | 8.0L / 489 |
| Compression Ratio | 10.0:1 |
| Cylinder Head Material | Aluminum |
| Engine Block Material | Cast iron |
| Assembled | Yes |
| Engine Balance | Internal |
| Cam Style | Hydraulic roller, OE roller |
| Rear Main Seal Style | 1-piece |
| Intake Manifold Included | Yes |
| Intake Manifold Style | Carbureted |
| Cylinder Heads Included | Yes |
| Carburetor Included | No |
| Throttle Body Included | No |
| Distributor Included | Yes |
| Oil Pan Included | Yes |
| Valve Covers Included | Yes |
| Timing Cover Included | Yes |
| Water Pump Included | Yes |
| Harmonic Balancer Included | Yes |
| Flexplate Included | Yes |
| Flywheel Included | No |
| Air Cleaner Included | No |
| Spark Plugs Included | No |
| Spark Plug Wires Included | No |
| Computer Included | No |
| Wiring Harness Included | No |
| Supercharger Included | No |
| Warranty Info | 1 Year |
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