Dart 31263554 Big M Cast Iron Engine Block, 10.2 Deck, 4.56 Bore

Dart 31263554 Big M Cast Iron Engine Block, 10.2 Deck, 4.56 Bore

$2,854.88
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SKU:
DAT31263554
MPN:
31263554
Condition:
New
Weight:
280.00 LBS
Shipping:
Calculated at Checkout

Applies To Continental U.S. orders only

Out of stock

Dart engineered the Big M to be the strongest, most reliable, and easiest to build big block on the market.

 

With deck heights of 9.800 in. and 10.200 in. and bore sizes up to 4.600 in., the Big M gives you the versatility to build a wide variety of engine combinations.

 

The Big M 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).
    • Main Journal Type:
    Standard BBC
    Engine Block Style:
    Stock/OEM standard deck
    Deck Height (in.):
    10.200 in.
    Cylinder Bore as Shipped:
    4.550 in.
    Cylinder Bore Diameter:
    4.560 in.
    Maximum Bore Diameter:
    4.625 in.
    Engine Block Material:
    Cast iron
    Engine Block Weight (lbs):
    280 lbs.
    Main Bolt Style:
    4-bolt
    Main Caps Included:
    Yes
    Main Cap Material:
    Billet Steel
    Main Cap Fasteners Included:
    Yes
    Main Bearings Included:
    No
    Rear Main Seal Style:
    2-piece
    Finished Cylinder Bores:
    No
    Raised Cam Location:
    No
    Cam Bearings Included:
    Yes
    Freeze Plugs Included:
    Yes
    Quantity:
    Sold individually.
    Notes:
    Block bores are .10 undersized to allow for piston set up.