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Atk Marine Rebuilt Long Block Engines Dm20
$1,200.00
The ATK Marine Rebuilt Long Block (DM20) delivers a reliable and durable engine solution for marine applications.
Professionally rebuilt with premium components, this long block ensures consistent performance, extended service life, and ready-to-install convenience for boats and marine watercraft.
Condition: New
The DM20 Marine Rebuilt Long Block from ATK is engineered for marine enthusiasts and professionals seeking a dependable replacement engine.
Each engine undergoes complete inspection, refurbishment of worn components, and precise assembly, providing durable and reliable performance on the water.
Included Components:
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Engine block
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Cylinder heads
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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 rebuilt and tested
Performance Overview:
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Engine type: V8 marine long block
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Professionally rebuilt for long-term reliability
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Ideal for boats, watercraft, and marine engine replacement or upgrades
Key Features
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Professionally rebuilt marine long block engine
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Fully assembled and factory-tested
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Includes all essential components for installation
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Engineered for durability and marine performance
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Suitable for replacement, restoration, or upgrade projects
Key Technical Specifications
| Specification | Details |
|---|---|
| Brand | ATK Marine |
| Part Number | DM20 |
| Engine Type | V8 Marine Long Block |
| Condition | Rebuilt / Professionally Assembled |
| Block Material | Cast Iron |
| Cylinder Heads | Aluminum / Cast Iron (as specified) |
| Crankshaft | Forged Steel / Rebuilt |
| Connecting Rods | Rebuilt / Standard |
| Pistons | Rebuilt / Standard |
| Camshaft Type | Standard Marine Performance Cam |
| Fuel System | Compatible with marine fuel systems |
| Fuel Type | Gasoline / Marine Fuel |
| Cooling System | Water-Cooled |
| Country of Origin | United States |
| Included Components | Block, heads, rotating assembly, valve train, oil pan, timing components, valve covers |
| Recommended Use | Boats, marine watercraft, engine replacement, and upgrades |
Compliance & Disclaimer
Engine performance may vary depending on marine application and installation.
Professional installation and inspection of fuel, ignition, and cooling systems are recommended.
Not certified for emissions-controlled regions without additional modifications.
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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 Anisa Zahra
by Aiden Lee