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Part number: 31273344V
Product Details
Dart 31273344V Big M Block
Big M Sportsman Block
Gen V

With multiple deck heights and bore sizes up to 4.600, the Big M Sportsman block gives you the versatility to build a wide variety of engine combinations. A true priority main oiling system oils the main bearings before the lifters for extra reliability.

Features:

  • Standard 9.800 and tall 10.200 deck heights available for stroker engines.
  • Standard 4.250 , 4.500 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.
  • Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures.
  • 2 bolt front and rear and 4 bolt interior ductile iron main caps have splayed outer bolts for extra strength OR 4 bolt billet steel main caps have splayed outer bolts for extra strength.
  • Crankshaft tunnel has clearance for a 4.500 stroke crank with steel rods without grinding.
  • True priority main oil system lubricates the main bearings before the lifters. Our stepped main oil gallery (9/16 to 1/2 to 7/16) increases the flow of oil to the crank at high rpm, and our front oil crossover eliminates internal oil leaks around the distributor shaft.
  • Oil filter pad is drilled and tapped for an external oil pump.
  • Available in traditional Gen IV style, or in Gen V or Gen VI style with one piece rear seal.
  • Lifter valley head stud bosses prevent blown head gaskets.
  • Rear main cap uses standard oil pump and two piece seal no adapter required!
  • Mechanical fuel pump boss, clutch linkage mounts, and side and front motor mounts simplify installation in any chassis.
  • Dual oil pan bolt patterns fit standard and notched oil pans.
  • Coated cam bearings, freeze plugs and dowels are included.
Reviews
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M
Best prices I could find anywhere! Fast shipping. Will definitley buy from again.
J
Easy to find needed parts
8
Hard to find part, in stock, and the best price around.  Amazing!!!
J
Product delivered as expected within 4 days.  Lowest price on the web.  No complaints.
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