ATK Marine DM20 Chevy 350 5.7L Rebuilt Long Block Engine

ATK Marine DM20 350ci Marine Long Block

ATK Marine DM20 Chevy 350 5.7L Rebuilt Long Block Engine units deliver a classic high-performance marine powertrain for universal inboard 350ci applications. This 5.7L 350ci Small Block Chevy features cast-iron cylinder heads and a seasoned cast-iron block, engineered to achieve the low-end torque and structural durability necessary for marine use. Built with a hydraulic flat tappet camshaft and a precision internal balance, this remanufactured unit provides a professional-grade foundation for enthusiasts demanding a reliable replacement for their marine propulsion system.

As a Stage 1 remanufactured marine foundation, the ATK DM20 arrives in an un-dressed state, allowing builders to select and transfer their own marine-grade induction and ignition systems. This unit is a direct performance fit for classic Small Block Chevy marine platforms and is protected by a professional 1-Year limited warranty to ensure long-term structural reliability. Featuring a traditional 2-piece rear main seal, this 350ci long block is the ultimate choice for enthusiasts requiring traditional marine aesthetics with professional assembly standards.

Key Features of ATK Marine DM20

• 5.7L 350ci displacement optimized for reliable marine power.
• Cast iron cylinder heads and block for traditional structural strength.
• Hydraulic flat tappet camshaft ensures consistent valvetrain operation.
• Internal engine balance configuration for smooth power delivery.
• Traditional 2-piece rear main seal design for classic marine blocks.
• Seasoned block casting provides long-term structural integrity.
• Backed by a professional 1-Year limited warranty.

DM20 Include:

• Cylinder Heads