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Atk High Performance Gm 383 Stroker 500 Hp Stage 3 Long Block Crate Engines Hp55C
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$4,800.00
The ATK High Performance GM 383 Stroker Stage 3 Long Block (HP55C) delivers 500 horsepower of high-performance power for GM muscle cars, street builds, and performance applications.
Fully assembled and precision-engineered, this long block ensures turnkey installation, reliable operation, and maximum performance, making it ideal for enthusiasts upgrading or restoring their GM vehicles.
Condition: New
The GM 383 Stroker Stage 3 Long Block (Part #HP55C) is designed for enthusiasts seeking peak performance, durability, and modern drivability.
Stage 3 builds feature forged internals, high-performance camshaft, precision-balanced rotating assembly, and premium aluminum cylinder heads, providing strong torque, horsepower, and street-ready drivability.
Included Components:
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Engine block
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Aluminum cylinder heads
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Stage 3 performance camshaft
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Rotating assembly (crankshaft, rods, pistons)
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Oil pan
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Timing components
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Valve covers
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Fully assembled, ready for installation
Performance Overview:
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383 C.I.D. (6.3L) Stroker V8 engine
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500 horsepower output
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Stage 3 performance build
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Compatible with GM muscle cars, street builds, and performance upgrades
Key Features
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ATK High Performance GM 383 Stroker Stage 3 long block
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500 horsepower output
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Fully assembled and factory-tested
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Includes all critical components for installation
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Engineered for street, muscle car, and performance builds
Key Technical Specifications
| Specification | Details |
|---|---|
| Brand | ATK High Performance |
| Part Number | HP55C |
| Engine Type | V8, GM 383 Stroker |
| Configuration | Stage 3 Long Block Crate Engine |
| Displacement | 383 C.I.D. / 6.3L |
| Horsepower | 500 Hp |
| Torque | Check Manufacturer Specs |
| Block Material | Cast Iron |
| Cylinder Heads | Aluminum |
| Crankshaft | Forged Steel |
| Connecting Rods | Forged Steel |
| Pistons | Forged Aluminum |
| Camshaft Type | Stage 3 Performance Cam |
| Fuel System | Not Included (EFI optional) |
| Fuel Type | Gasoline |
| Ignition System | Not Included |
| Cooling System | Water-Cooled |
| Condition | Brand New / Factory-Tested |
| Country of Origin | United States |
| Included Components | Block, heads, camshaft, rotating assembly, valve train, oil pan, timing components, valve covers |
| Recommended Use | GM vehicles, muscle cars, street builds, performance upgrades, restoration projects |
Compliance & Disclaimer
Horsepower and torque ratings should be verified with ATK High Performance specifications.
Professional installation and proper break-in procedures are recommended.
EFI or fuel injection setup may require compatible components.
Not certified for emissions-controlled vehicles in all regions.
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Return Policy
FourToolz accepts returns within 30 days of delivery for items that are unused, in their original packaging, and include all accessories.
Customers are responsible for return shipping costs unless the product is defective or incorrectly shipped.
For detailed information, please review our full Return Policy or contact us at sales@fourtoolz.com.
by Henry Adams
by Mason Garcia