ATK High Performance Engines DM03 Chevy 350 5.7L Marine Crate Engine

The ATK High Performance Engines DM03 is a complete marine crate engine designed specifically for 1964-1980 Chevrolet marine applications. This 5.7L (350 cubic inch) small block Chevy marine engine delivers 270 horsepower and is engineered for reliable performance in saltwater and freshwater environments.

Key Specifications:

• Displacement: 5.7L / 350 cubic inches
• Power Output: 270 horsepower
• Compression Ratio: 9.0:1
• Rotation: Reverse rotation (counterclockwise)
• Rear Main Seal: 2-piece design for 1964-1980 compatibility
• Block Material: Cast iron construction
• Cylinder Heads: Cast iron
• Balancing: Internally balanced
• Dipstick Location: Port side (left side when facing forward)
• Camshaft Type: Flat tappet hydraulic cam

Marine-Specific Features:

• Reverse rotation configuration for direct marine drive applications
• Marine-grade components designed for harsh aquatic environments
• Port side dipstick placement for proper marine installation clearance
• Compatible with standard Chevy marine exhaust manifolds and accessories

This engine is ideal for replacing worn-out original marine engines in classic boat applications. The 9:1 compression ratio provides a good balance of power and reliability when running on standard marine fuel. All ATK marine engines are assembled with quality components and tested to ensure proper operation before shipping.