Atk High Performance Gm 383 Stroker 500 Hp Stage 2 Long Block Crate Engines Hp55M
$4,200.00
The ATK High Performance GM 383 Stroker Stage 2 Long Block (HP55M) delivers 500 horsepower of high-performance power for Chevrolet vehicles, muscle cars, and street builds.
Fully assembled and factory-tested, this long block ensures consistent power, durability, and turnkey installation for street, mild racing, or restoration projects.
Condition: New
The GM 383 Stroker Stage 2 Long Block (Part #HP55M) is engineered for enthusiasts seeking maximum performance with reliability.
This Stage 2 stroker includes precision-engineered components, forged rotating assembly, Stage 2 performance camshaft, and upgraded internals, ideal for street, muscle car, and mild racing applications.
Included Components:
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Engine block
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Cylinder heads
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Camshaft and valve train
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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
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 2 performance build
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Fully assembled long block for turnkey installation
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Compatible with Chevrolet vehicles, street builds, and muscle cars
Key Features
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ATK High Performance GM 383 Stroker Stage 2 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 engine components for installation
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Engineered for street, muscle car, and mild performance builds
Key Technical Specifications
| Specification | Details |
|---|---|
| Brand | ATK High Performance |
| Part Number | HP55M |
| Engine Type | V8, GM 383 Stroker |
| Configuration | Stage 2 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 2 Performance Cam |
| Fuel System | Not Included |
| 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 | Chevrolet vehicles, street builds, muscle cars, mild 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.
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 Jack Turner
by Fauzan Malik