ATK High Performance GM 489 Stroker 565 HP Stage 3 Long Block Crate Engines HP411PC
$6,028.00
Crate Engines, GM 489 Stroker 565 HP Stage 3 Long Block, 8.0L/489, Assembled, Aluminum Heads, Carbureted, Chevrolet, 7.4L Big Block Gen V, Each
Buy ATK High Performance GM 489 Stroker 565 HP Stage Online
The ATK High Performance GM 489 Stroker 565 HP is a complete high-performance big-block Chevy crate engine designed for enthusiasts who want substantial horsepower, strong torque, and a professionally assembled powerplant for performance builds. With 489 cubic inches of displacement, this engine is rated at 565 horsepower and 595 lb-ft of torque, making it a powerful option for street and strip applications. The HP411PC is also identified as a Stage 3 complete GM V8 package, providing a more comprehensive setup than a basic long-block configuration.
At the heart of the GM 489 Stroker 565 HP is a seasoned OE Gen V 4-bolt-main block with a 4.310-inch bore and 4.250-inch stroke. The rotating assembly includes a Scat nodular-iron crankshaft and Scat 4340 forged I-beam connecting rods with ARP 8740 bolts. Forged pistons and moly rings complement the assembly, while the 10.1:1 compression ratio is designed for a strong performance-oriented combination.
The hydraulic roller camshaft contributes to the engine’s performance characteristics, with approximately 237/243 degrees of duration at 0.050-inch lift and .635/.640-inch lift. A double-roller timing chain helps complete the valvetrain setup. The engine also uses aluminum performance cylinder heads and 1.7-ratio billet aluminum roller rocker arms for efficient airflow and reliable valvetrain operation.
This complete package includes performance-oriented components such as an Edelbrock Performer RPM intake manifold, Quick Fuel carburetor, HEI distributor, water pump, oil pan, harmonic balancer, spark plugs, and ls crate engine spark plug wires. The engine uses a high-volume oil pump and is internally balanced at the crankshaft. Buyers should note that the Gen V block has no mechanical fuel-pump provision, so an electric fuel pump is required.
For builders looking for a substantial big-block upgrade, the ATK High Performance GM 489 Stroker 565 HP provides a professionally assembled combination of displacement, forged components, hydraulic-roller technology, and complete supporting hardware. Before installation, verify vehicle compatibility, drivetrain capacity, cooling requirements, exhaust configuration, and fuel-system requirements for your specific application.
Product Specifications of ATK High Performance GM 489 Stroker 565 HP
| Specification | Details |
|---|---|
| Brand | ATK Engines |
| Part Number | HP411PC |
| Engine Type | High-Performance Crate Engine |
| Engine Family | Chevy Big Block |
| Displacement | 489 CI |
| Horsepower | 565 HP |
| Torque | 595 lb-ft |
| Block | Seasoned OE Gen V 4-bolt main, 1-piece seal |
| Block Years | 1991–1995 |
| Block Material | Cast Iron |
| Bore | 4.310 in |
| Stroke | 4.250 in |
| Crankshaft | Scat Nodular Iron |
| Crankshaft Balance | Internally Balanced |
| Connecting Rods | Scat 4340 Forged I-Beam |
| Rod Length | 6.385 in |
| Rod Bolts | ARP 8740 |
| Pistons | Forged |
| Compression Ratio | 10.1:1 |
| Piston Rings | Moly |
| Camshaft | Hydraulic Roller |
| Intake Duration @ .050″ | 237° |
| Exhaust Duration @ .050″ | 243° |
| Intake Lift | .635 in |
| Exhaust Lift | .640 in |
| Lobe Separation Angle | 112 LSA |
| Timing Chain | Double Roller |
| Cylinder Heads | Aluminum Performance Heads |
| Combustion Chamber | 110–112 cc, depending on listed specification |
| Intake Runner | 290 cc |
| Intake Valve | 2.19–2.250 in, depending on listed specification |
| Exhaust Valve | 1.88 in |
| Rocker Arms | Billet Aluminum Roller |
| Rocker Ratio | 1.7 |
| Oil Pan | Performance 5–6 qt, depending on specification |
| Oil Pump | Melling High Volume |
| Harmonic Balancer | Internal Balance, 8 in |
| Flexplate | Internal Balance, 168 Tooth |
| Intake Manifold | Edelbrock Performer RPM |
| Distributor | HEI with Iron Gear |
| Water Pump | OE Long Pump |
| Carburetor | Quick Fuel Vacuum Secondary with Electric Choke |
| Carburetor Size | Approximately 770–780 CFM |
| Fuel Pump | Electric Fuel Pump Required |
| Spark Plugs | Autolite #3923 |
| Spark Plug Wires | 8 mm |
| Recommended Oil | Conventional 10W-30 |
| Recommended Timing | 34–36° |
| Spark Plug Gap | .035 in |
| Firing Order | 1-8-4-3-6-5-7-2 |
| Recommended Octane | 91+ |
| Recommended Stall Converter | 2800+ RPM |
| Recommended Exhaust | 2 in Headers |
| Engine Category | Deluxe/Complete Crate Engine |
| Cylinder Head Material | Aluminum |
| Piston Material | Forged Aluminum |
| Carburetor Included | Yes |
| Intake Manifold Included | Yes |
| Water Pump Included | Yes |
| Harmonic Balancer Included | Yes |
| Spark Plugs Included | Yes |
| Spark Plug Wires Included | Yes |
| Timing Cover | Included |
| Oil Pan | Included |
| Sold As | Each |
Benefits of ATK High Performance GM 489 Stroker 565 HP
- High Horsepower Output: 565 HP performance for demanding applications.
- Strong Torque: 595 lb-ft torque provides strong acceleration and pulling power.
- Large 489 CI Displacement: Bigger displacement supports strong overall engine performance.
- Forged Internal Components: Forged pistons and connecting rods provide a performance-focused rotating assembly.
- Hydraulic Roller Camshaft: Designed for strong airflow and high-performance engine operation.
- Aluminum Performance Heads: Lightweight aluminum cylinder heads support improved airflow and performance.
- Complete Crate Engine Package: Includes major supporting components for a more convenient installation.
What horsepower does the ATK GM 489 Stroker produce?
The HP411PC is rated at 565 horsepower and 595 lb-ft of torque, according to published technical specifications.
Does the GM 489 Stroker 565 HP require an electric fuel pump?
Yes. The Gen V block does not provide a mechanical fuel-pump provision, so an electric fuel pump is required for this engine.
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