Dart 31213344 Big M2 Cast Iron Engine Block, 9.8 Deck, 4.25 Bore

Dart 31213344 Big Block Chevy, Big M2, Cast Iron, 9.8 in. Deck, 4.25 in. Bore, 4-Bolt Main, 2-Piece Seal, Each

$4,799.99
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SKU:
DAT31213344
MPN:
31213344
Condition:
New
Weight:
250.00 LBS
Shipping:
Calculated at Checkout

Applies To Continental U.S. orders only

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Dart's popular line of Big M blocks just got bigger and more competition focused. 0.842 in lifter bores. These features represent the most demanded block upgrades requested by racers, now combined into convenient package.

 

With deck height of 9.800 in. and bore sizes up to 4.600 in., the Big M2 gives you the versatility to build a wide variety of engine combinations.

 

The Big M2 is fitted with Billet Steel 4-bolt main caps for ultimate bottom end strength.


Features
  • Billet Steel 4-bolt mains caps for ultimate bottom-end strength
  • Siamesed extra thick cylinder walls to resist cracking and improve ring seal (minimum .300 in. thick with 4.625 in. bore)
  • Uses +.300 in. tall GM Gen VI style lifters
  • 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
  • 220 BHN cast iron block material
  • .842 in. lifter bores
  • Press-fit freeze plugs
  • 2-Piece rear main seal
  • Big M Sportsman: Parts kit sold separately (PN 32000002).
    • Engine Block Material:
    Cast iron
    Engine Block Style:
    Aftermarket/OEM standard deck
    Deck Height:
    9.800 in.
    Cylinder Bore Diameter:
    4.250 in.
    Maximum Bore Diameter:
    4.625 in.
    Cylinder Bore as Shipped:
    4.240 in.
    Finished Cylinder Bores:
    No
    Maximum Stroke:
    4.750 in.
    Main Caps Included:
    Yes
    Main Cap Material:
    Billet Steel
    Main Bolt Style:
    4-bolt
    Main Journal Type:
    454 mains
    Rear Main Seal Style:
    2-piece
    Main Cap Fasteners Included:
    Yes
    Main Bearings Included:
    No
    Engine Block Weight (lbs.):
    280 lbs.
    Raised Cam Location:
    No
    Cam Bearings Included:
    No
    Freeze Plugs Included:
    Yes
    Finish:
    Natural
    Quantity:
    Sold individually.
    Notes:
    Block bores are .10 undersized to allow for piston set up.
    Make:
    Chevrolet
    Engine Family:
    Chevy big block Mark IV

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