ATK Marine DMM6 Chevy 350 5.7L Flat Tappet Rebuilt LB

ATK Marine DMM6 350ci Marine Long Block

ATK Marine DMM6 Chevy 350 5.7L Flat Tappet Rebuilt LB engines 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 maintain mechanical integrity and structural durability under sustained marine loads. Built with a traditional hydraulic flat tappet camshaft and a precision internal/external balance, this remanufactured unit is a professional-grade fit for marine enthusiasts requiring a dependable 350ci foundation.

As a Stage 1 remanufactured marine foundation, the ATK DMM6 arrives in an un-dressed state to allow for full build customization with marine-grade accessories. While this long block includes the cylinder heads, builders must provide their own marine-grade intake manifold, oil pan, and ignition system to complete the installation. Backed by a professional 1-Year limited warranty, this unit features a modern one-piece rear main seal and is built on a seasoned block casting to ensure the structural integrity required for recreational or commercial boating.

Key Features of ATK Marine DMM6

• 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 and external engine balance for smooth power delivery.
• Modern one-piece rear main seal design prevents chronic fluid leaks.
• Seasoned block casting provides long-term structural integrity.
• Standard 1-Year professional limited warranty included.

DMM6 Include:

• Cylinder Heads