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

Manufacturer

ATK High Performance Engines

<h3>ATK High Performance Engines: American Muscle, Built Right</h3><p><strong>ATK High Performance Engines</strong> has grown into one of the largest performance engine shops in the United States, earning a reputation for quality, craftsmanship, and broad platform coverage. <a href="/3092-atk-high-performance-engines">Founded in 2007 and headquartered in Grand Prairie, Texas</a>, ATK was built on a straightforward mission: produce top-quality engines using name-brand components, at a range of power levels to fit every budget and application.</p><p>Leading the company is a team of dedicated engine builders whose combined experience spans street, strip, marine, and off-road applications. With over 40 years of race engine development knowledge guiding the product line, ATK brings professional-grade expertise directly to enthusiasts and builders. Every engine that leaves their facility is dyno-proven, ensuring the horsepower ratings on paper translate to real-world results under the hood.</p><h3>A Lineup Built for Every Builder</h3><p>ATK organizes its performance engine catalog into two flagship tiers. The <strong>Signature Series</strong> is engineered for street rods, restomods, and daily drivers that demand reliable power without unnecessary complication. The <strong>Elite Series</strong> raises the bar further, targeting hardcore racers and serious builders who insist on premium components throughout the assembly. Within both series, buyers can select from short block, mid-dress, or fully <a href="/3092-atk-high-performance-engines-engine-complete-assembly-15341">complete engine assembly</a> configurations, making it easy to match the engine package to any build's specific requirements and budget.</p><p>Platform coverage is one of ATK's defining strengths. <a href="/3092-atk-high-performance-engines-engine-complete-assembly-15341">GM enthusiasts</a> are well served with small-block Chevy (SBC), big-block Chevy (BBC), modern LS, and Gen V LT offerings. Ford builders can choose from 302, 347 Stroker, and 351 Windsor combinations, while Mopar fans will find 360 Magnum and other Chrysler-based options rounding out the catalog.</p><h3>Short Blocks, Cylinder Heads & Parts</h3><p>Not every builder needs a fully dressed engine, and ATK accommodates that with a robust selection of <a href="/3092-atk-high-performance-engines-engine-short-block-5244">engine short blocks</a> — the perfect foundation for a custom build using your own top-end components. For those working from the heads down, ATK's <a href="/3092-atk-high-performance-engines-engine-cylinder-head-5304">engine cylinder heads</a> are cast from A356 aluminum alloy and feature optimized port designs, stainless steel valves, and manganese bronze valve guides. Cast, machined, and assembled in the USA, these heads accept factory components without modification and are available for SBC, BBC, LS, LS3, and small-block Ford applications.</p><p>Beyond rotating assemblies and top-end components, ATK also carries a growing catalog of <a href="/200373-engine-parts-accessories-atk-high-performance-engines-3092">engine parts and accessories</a> — valve covers, individual cylinder head components, and other hardware useful for completing or refreshing a build. This positions ATK as a comprehensive powertrain resource rather than just a crate engine supplier.</p><h3>Backed by an Industry-Leading Warranty</h3><p>ATK stands behind every engine they build with a 24-month, unlimited-mile warranty on their performance engines — a statement of confidence that is rare in the high-performance segment. Whether you are swapping in a crate engine for a weekend cruiser or building a purpose-built race car, ATK High Performance Engines delivers the combination of quality, selection, and peace of mind that serious builders rely on.</p>

Part Number

DM03
09/17/2036 12:08 AM
Sale Price

$3,847.08

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Usually delivered within 2 days

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Product Details

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.

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