Atk High Performance Gm 350 390 Hp Stage 3 Long Block Crate Engines With Efi Hp89C-Efi
$3,600.00
The ATK High Performance GM 350 Stage 3 Long Block (HP89C-EFI) delivers 390 horsepower of high-performance, EFI-ready power for Chevrolet vehicles, trucks, and classic builds.
Fully assembled and factory-tested, this crate engine ensures durable performance, reliable operation, and turnkey installation for street, performance, or restoration projects.
Condition: New
The GM 350 Stage 3 Long Block (Part #HP89C-EFI) is engineered for enthusiasts seeking maximum performance with modern EFI compatibility.
This Stage 3 long block features precision-engineered components, a forged rotating assembly, Stage 3 camshaft, and EFI-ready design, ideal for street, mild performance, and restoration builds.
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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350 C.I.D. (5.7L) V8 engine
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390 horsepower output
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Stage 3 performance build
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EFI-ready for modern fuel injection systems
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Fully assembled long block for turnkey installation
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Compatible with GM vehicles, trucks, and classic muscle car builds
Key Features
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ATK High Performance GM 350 Stage 3 long block
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390 horsepower output
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EFI-ready for modern fuel injection systems
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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, mild performance, and restoration builds
Key Technical Specifications
| Specification | Details |
|---|---|
| Brand | ATK High Performance |
| Part Number | HP89C-EFI |
| Engine Type | V8, GM 350 |
| Configuration | Stage 3 Long Block Crate Engine |
| Displacement | 350 C.I.D. / 5.7L |
| Horsepower | 390 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 | EFI-Ready (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 | GM vehicles, trucks, muscle cars, street builds, EFI upgrades, performance restorations |
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 Hannah Kim
by Victoria Rossi