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Dart Big M Sportsman Block

Dart Big M Sportsman Block

Your Price: $2,215.47
Retail Price:$2,365.39
Your Savings:$149.92(6%)
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Part Number:31273

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Deck Height
Bore SIze

Dart Big M Sportsman Block

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.


  • 9.800 or 10.200 Deck height.
  • 4.250 - 4.600" Available 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.
  • 4 bolt ductile iron main caps have splayed outer bolts for extra strength.
  • 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.
  • 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.
  • Small bore 396 version available
  • Coated cam bearings, freeze plugs and dowels are NOT included.


Please call us for an exact freight price at 305-893-5018

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