Dart 31213554 Big M2 Cast Iron Engine Block, 10.2 Deck, 4.56 Bore

Dart 31213554 Big Block Chevy, Big M2, Cast Iron, 10.2 in. Deck, 4.56 in. Bore, Billet Caps, 4-Bolt Main, 2-Piece Seal, Each

$5,096.07
(No reviews yet) Write a Review
SKU:
DAT31213554
MPN:
31213554
Condition:
New
Weight:
280.00 LBS
Shipping:
Calculated at Checkout

Applies To Continental U.S. orders only

Out of stock

Dart's popular line of Big M blocks just got bigger and more competition focused. These new Big M2 blocks feature 55mm roller cam tunnels, larger .904 in lifter bores, doweled main caps and raised lifter oil galleries. These features represent the most demanded block upgrades requested by racers, now combined into convenient package.

 

With deck heights of 9.800 in. and 10.200 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. The Sportsman block is fitted with Ductile Iron 4-bolt main caps.


Features
  • Standard 9.800” and tall 10.200” deck heights.
  • Standard 4.250”, 4.500”, 4.560” or 4.600” bore sizes with siamesed
  • Extra thick cylinder walls to resist cracking and improve ring seal (minimum .300” thick with 4.625” bore).
  • Uses +.300” tall Gen VI style lifters. Modification for Gen IV style available.
  • 4-bolt main bearing caps in steel or Ductile Iron have splayed outer bolts for extra strength.
  • True priority main oil system lubricates the main bearings before the lifters.
  • Dart stepped main oil gallery (9/16“ to 1/2“ to 7/16“) increases the flow of oil to the crank at high RPM,
  • Dart 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.
  • Big M Sportsman: Parts kit sold separately (PN 32000002).
    • Engine Block Material:
    Cast iron
    Engine Block Style:
    Aftermarket/OEM tall deck
    Deck Height:
    10.200 in.
    Cylinder Bore Diameter:
    4.560 in.
    Maximum Bore Diameter:
    4.625 in.
    Cylinder Bore as Shipped:
    4.550 in.
    Finished Cylinder Bores:
    No
    Maximum Stroke:
    N/A
    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

    Related Products