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Part number: 31112232
Product Details
Dart 31112232 Short Blocks
Products specifications
Cam Bearings Included Yes
Cyl Bore 4.125in
Cylinder Bore as Shipped 4.125 in.
Deck 9.5in
Deck Height (in) 9.500 in.
Engine Block Material Aluminum
Engine Block Style Aftermarket
Engine Block Weight (lbs) 95 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 400 mains
Maximum Cylinder Bore Diameter 4.185 in.
Quantity Sold individually.
Raised Cam Location Yes
Rear Main Seal Style 2-piece
Tool Stroker Combinations
Aluminum SBC Block
400 Mains

Dart aluminum small blocks are available in standard (9.025) and tall deck (9.325 to 9.500) versions. We raised the camshaft and spread the oil pan rails to provide extra clearance for stroker cranks.

With displacements up to 455 cubic inches, a Dart aluminum block is ideal for sprint cars, modifieds, late model stock cars, dragsters and unlimited competition classes.


  • Standard 9.025 and tall deck 9.325 versions allow for greater versatility.
  • Raised camshaft .391 (4.912 camshaft to crankshaft centerlines) provides more
    clearance for stroker cranks and eliminates need for fragile small base circle cams. Option for .434 raised cam also available.
  • Relocated oil pan rails are spread .400 per side (.800 wider than stock) to increase crank/rod clearance and reduce windage losses.
  • Siamesed cylinders: Standard 4.000 or 4.125 cylinder can be safely bored to 4.185. Extra thick walls prevent cracking and produce excellent ring seal.
  • Oil pan bolt holes are relocated in line with main caps to eliminate interference with rotating assembly.
  • Main bearing bores are available for 350 (2.45) and 400 (2.65) bearings allow engine builders to maximize crankshaft strength and minimize friction.
  • 4 bolt billet steel main caps have splayed outer bolts minimize bearing bore distortion.
  • Big block camshaft bearings allow use of cams with larger base circle diameter to improve strength and rescue twisting with cam driven pumps.
  • Dual starter mounts allow starter to be mounted on either side of block for chassis and oil pan clearance.
  • Front and rear external oil inlets, crossover and restrictor provisions to simplify plumbing with external pump.
  • Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures.
  • Coated cam bearings, freeze plugs and dowels are included.
  • Dart blocks are available fully finish prepped.
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