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31223344 Big Block Chevy Big M Sportsman Cast Iron Engine Block 4.250 in. Bore
Product Discontinued
DARTPART NUMBER: 301-31223344

31223344 Big Block Chevy Big M Sportsman Cast Iron Engine Block 4.250 in. Bore

Currently Unavailable

This product is no longer available. Please call customer service for assistance at 1-800-345-4545.

Iron Blocks W/Ductile Iron Main Caps
Big M Sportsman Cast Iron Engine Block
  • Big Block Chevy
  • 4.250 in. Bore
  • 9.800 in. Deck Height (STD.)
  • Standard Mains
  • Ductile Iron 4-Bolt Main Caps
  • Standard Cam Height
  • 2-Piece Rear Main Seal

    Oiling System Tech Tip

    Dart 31223344 Big Block Chevy Big M Sportsman Cast Iron Engine Block Features:

    • Ductile iron 4-bolt mains caps for ultimate bottom-end strength
    • Siamesed extra thick cylinder walls to resist cracking and improve ring seal
    • Crankshaft tunnel has clearance for a 4.500 in. stroke with steel rods without grinding
    • Main bearing caps have splayed outer bolts for extra strength
    • True priority main oil system lubricates the main bearings before the lifters
    • Stepped main oil gallery (9/16 in. to 1/2 in. to 7/16 in.) increases the flow of oil to the crankshaft at high RPM, and front oil crossover eliminates internal oil leaks around the distributor shaft
    • Lifter valley head stud bosses prevent blown head gaskets
    • Dual oil pan bolt patterns fit standard and notched oil pans

    Dart 31223344 Big Block Chevy Big M Sportsman Cast Iron Engine Block Specs:

    • Material: 220 BHN cast iron
    • Main Journal Type: 454 Main
    • Deck Height: 9.800 in.
    • Cylinder Bore as Shipped: 4.240 in.
    • Cylinder Bore Diameter: 4.250 in.
    • Finished Cylinder Bores: No
    • Main Caps Included: Yes
    • Main Cap Material: Ductile Iron
    • Main Bolt Style: 4-Bolt
    • Main Cap Fasteners Included: Yes
    • Lifter Bore Diameter: .842 in.
    • Camshaft Bore: Standard
    • Provisions for OE Roller Lifters: No
    • Main Bearings Included: No
    • Rear Main Seal Style: 2-Piece
    • Oil Pan Rail Type: Dual pattern
    • Raised Cam: No
    • Cam Bearings Included: No
    • Freeze Plugs Included: No
    • Weight: 280 lbs.
    • Requires Dart Cam Bearing, Freeze Plug Parts Kit 32000002 or equivalent (sold separately)

    Emissions Note:

    This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

    CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

    • The Strongest and Most Reliable Big Block Available!

      Dart has reinvented the "Rat Motor" with their cast-iron Big M big blocks. Working with top builders and Dart's own championship-winning Pro Stock engine department, they have designed a no-compromise, user-friendly block that solves the problems that have plagued big-block racers for years. Each unit is in-house machined on precision CNC equipment to ensure the highest quality and to eliminate the need for expensive blueprinting.

      Show More

      The Dart Big Block Chevy Big M Engine Block is a purpose-built foundation for serious horsepower, engineered for racers and high-performance builders who demand strength beyond OEM limits. Designed specifically for extreme big block applications, the Dart Big Block Chevy Big M Engine Block delivers reinforced construction, expanded displacement capability, and race-ready durability. Whether you’re assembling a high-horsepower street engine or a competition-only drag racing build, this aftermarket engine block provides the structural integrity needed to handle substantial torque capacity and cylinder pressure.

      Unlike factory castings, the Big M block is engineered with thicker cylinder walls, priority main oiling, and reinforced main webs to support elevated horsepower levels. For enthusiasts pushing forced induction, nitrous, or large cubic inch combinations, starting with a high-strength performance engine block like the Big M is critical to long-term reliability and consistent results.

      Performance Benefits & Key Features

      The Dart Big Block Chevy Big M Engine Block is manufactured from premium high-strength cast iron to withstand extreme loads and high RPM use. Key features often include siamese cylinder bores for increased displacement potential, four-bolt or cross-bolted main caps for added bottom-end stability, and priority main oiling to ensure consistent lubrication under racing conditions.

      Performance builders value specifications such as bore size flexibility, deck thickness, improved oil control, and compatibility with stroker rotating assemblies. These attributes allow for large cubic inch combinations capable of producing significant horsepower and torque. Enhanced rigidity reduces block flex, supporting improved ring seal and long-term durability in high-output builds.

      This block is ideal for drag racing applications, high-performance street builds, marine engines, and competition-oriented projects where power levels exceed stock limitations. It’s particularly well-suited for naturally aspirated big cubic inch engines as well as supercharged or turbocharged combinations requiring a robust bottom-end foundation.

      Fitment, Compatibility & Applications

      The Big M engine block is designed for Chevrolet big block compatibility, making it a natural fit for custom builds based on GM big block architecture. Popular applications include classic muscle cars such as Chevelle, Camaro, Nova, and full-size Chevrolet models, along with C10 and other GM truck platforms configured for big block installation.

      Engine builders appreciate the block’s flexibility for stroker assemblies and high-performance cylinder head combinations, making it adaptable for both street performance and dedicated race vehicles. Its compatibility with standard big block Chevy components allows experienced builders to tailor the engine to specific displacement and performance goals.

      When you’re building serious horsepower from the ground up, start with a proven foundation. Explore the Dart Big Block Chevy Big M Engine Block options at JEGS and choose the strength and precision your high-performance build demands.

    Part TypeEngine Block
    Product LineDart Big Block Chevy Big M Engine Block
    BrandDART
    Package Height14.0
    Package Width19.5
    Package Length24.0
    Weight300.0 PG
    Part CategoryPerformance Parts
    Main Journal TypeOEM
    Engine Block StyleStock/OEM standard Deck
    Engine Block MaterialCast iron
    Cylinder Bore As Shipped4.24 in (107.696 mm)
    Engine Block Weight (Lbs.)280
    QuantitySold individually
    Raised Cam LocationNo
    Freeze Plugs IncludedNo
    Main Bolt Style4-bolt
    Deck Height9.8 in (248.92 mm)
    Main Bearings IncludedNo
    Main Cap MaterialDuctile iron
    Rear Main Seal Style2-piece
    Main Caps IncludedYes
    Finished Cylinder BoresNo
    Cylinder Bore Diameter4.25 in (107.95 mm)
    Cam Bearings IncludedNo
    Part FitmentSemi Universal
    Main Cap Fasteners IncludedYes
    Vendor Part Number31273344
    Package Qty1
    Package TypeEA
    No Questions
    No Reviews

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