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31273444 - Dart Big M Block


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Part #: 31273444
Notes: Big M Sportsman Block
MSRP: $2,513.53
Your Price: $2,205.15
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Specs

Cyl Bore 4.5in
Deck 9.8in

This Item Also Available In

Part Number Price Notes & Specs
31264444 $6,187.92 Notes Big M Aluminum Chevy Big Block
Steel Main Caps
Cyl Bore 4.5in
Deck 9.8in
31264454 $6,187.92 Notes Big M Aluminum Chevy Big Block
Steel Main Caps
Cyl Bore 4.5in
Deck 10.2in
31273344V $2,137.43 Notes Big M Sportsman Block
Gen V
31273344 $2,137.43 Notes Big M Sportsman Block
Cyl Bore 4.25in
Deck 9.8in
31283435 $3,412.93 Notes Big M Pro Engine Block
Cyl Bore 4.5in
Deck 9.6in
31283635 $3,356.35 Notes Big M Pro Engine Block
Cyl Bore 4.6in
Deck 9.6in
31263454 $2,666.30 Notes Big M Chevy Big Block
Cyl Bore 4.5in
Deck 10.2in
31273354V $2,137.43 Notes Big M Sportsman Block
Gen V
31274444 $5,948.38 Notes Big M Aluminum Chevy Big Block
Ductile Iron Main Caps
Cyl Bore 4.5in
Deck 9.8in
31263644 $2,666.30 Notes Big M Chevy Big Block
Cyl Bore 4.6in
Deck 9.8in
31273644 $2,205.15 Notes Big M Sportsman Block
Cyl Bore 4.6in
Deck 9.8in
31274454 $5,948.38 Notes Big M Aluminum Chevy Big Block
Ductile Iron Main Caps
Cyl Bore 4.5in
Deck 10.2in
31283445 $3,412.93 Notes Big M Pro Engine Block
Cyl Bore 4.5in
Deck 9.8in
31263654 $2,709.17 Notes Big M Chevy Big Block
Cyl Bore 4.6in
Deck 10.2in
31273654 $2,240.60 Notes Big M Sportsman Block
Cyl Bore 4.6in
Deck 10.2in
31274354 $5,948.38 Notes Big M Aluminum Chevy Big Block
Ductile Iron Main Caps
Cyl Bore 4.25in
Deck 10.2in
31264644 $6,187.92 Notes Big M Aluminum Chevy Big Block
Steel Main Caps
Cyl Bore 4.6in
Deck 9.8in
31264654 $5,948.38 Notes Big M Aluminum Chevy Big Block
Steel Main Caps
Cyl Bore 4.6in
Deck 10.2in
31273354 $2,137.43 Notes Big M Sportsman Block
Cyl Bore 4.25in
Deck 10.2in
31274654 $5,948.38 Notes Big M Aluminum Chevy Big Block
Ductile Iron Main Caps
Cyl Bore 4.6in
Deck 10.2in
31283645 $3,412.93 Notes Big M Pro Engine Block
Cyl Bore 4.6in
Deck 9.8in
31263354 $2,582.47 Notes Big M Chevy Big Block
Cyl Bore 4.25in
Deck 10.2in
31263444 $2,709.17 Notes Big M Chevy Big Block
Cyl Bore 4.5in
Deck 9.8in
31264354 $6,187.92 Notes Big M Aluminum Chevy Big Block
Steel Main Caps
Cyl Bore 4.25in
Deck 10.2in
31273344VI $2,137.43 Notes Big M Sportsman Block
Gen VI

All Fitments

UNKNOWN
Year Model SubModel Cylinders Liter Aspiration Eng Desg. Fuel Notes
0 - 0 ALL ALL ALL ALL ALL ALL

Product Description

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.

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