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July Sale: $3,070.18
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Part number: 31263454
Product Details
Dart 31263454 Short Blocks
Products specifications
Cam Bearings Included Yes
Cyl Bore 4.5in
Cylinder Bore as Shipped 4.500 in.
Deck 10.2in
Deck Height (in) 10.200 in.
Engine Block Material Cast iron
Engine Block Style Aftermarket/OEM tall deck
Engine Block Weight (lbs) 260 lbs.
Finished Cylinder Bores Yes
Freeze Plugs Included Yes
Main Bearings Included No
Main Bolt Style 4-bolt
Main Cap Fasteners Included Yes
Main Cap Material Steel billet
Main Caps Included Yes
Main Journal Type OEM
Maximum Cylinder Bore Diameter 4.625 in.
Quantity Sold individually.
Raised Cam Location No
Rear Main Seal Style 2-piece
Tool Stroker Combinations
Big M Chevy Big Block

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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J
Dart block
Exactly what i ordered and great shipping time even with holiday
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