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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
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.
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.
Questions & Answers
Have a question about this product? Ask below — we’ll reply as soon as possible.
Return & Refund Policy
- Return Period: Within 30 days of delivery.
- Condition: Unused, original packaging, all accessories included.
- Non-Returnable: Gift cards, personal care, custom or digital items, sale items.
- How to Return: Email support@fastoutboard.com for RMA and return address.
- Shipping: Customer pays unless item is faulty or incorrect.
- Refund: Processed within 5–10 business days after inspection.
Warranty
- Coverage: 1-Year limited warranty for manufacturing defects.
- Excludes: Misuse, wear, or unauthorized repair.
- Claim: Email proof and photos to support@fastoutboard.com.
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