ATK Marine DMW3 Chevy 350 5.7L Vortec Rebuilt Long Block

ATK Marine DMW3 4.3L V6 Marine Engine

ATK Marine DMW3 Chevy 350 5.7L Vortec Rebuilt Long Block engines provide a robust high-torque marine powertrain solution specifically engineered for mid-size inboard and sterndrive applications. Despite the 350ci mention in the title, technical specifications confirm this is a 4.3L 262ci Chevy V6 featuring cast-iron cylinder heads and a seasoned cast-iron block. Built with a modern hydraulic roller camshaft and a precision internal/external balance, this remanufactured V6 unit is a direct performance fit for marine enthusiasts requiring a durable and smooth-operating foundation.

Designing your marine swap is streamlined by this remanufactured marine foundation, which arrives in an un-dressed Stage 1 state to allow for full builder customization. While the ATK DMW3 includes the cylinder heads, builders must provide their own marine-grade intake manifold, oil pan, and ignition system. Protected by a professional 1-Year limited warranty, this V6 long block utilizes a modern one-piece rear main seal and is built on a seasoned block casting, ensuring the structural integrity required for sustained operation in aquatic environments.

Key Features of ATK Marine DMW3

• 4.3L 262ci displacement optimized for reliable V6 marine power.
• Cast iron cylinder heads and block for traditional structural durability.
• Hydraulic roller camshaft ensures consistent and quiet valvetrain operation.
• Internal and external engine balance for smooth power delivery.
• Modern one-piece rear main seal prevents common fluid weeping.
• Seasoned block casting provides long-term structural integrity.
• Backed by a professional 1-Year limited warranty.

DMW3 Include:

• Cylinder Heads