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Dart 31131211 Little M Chevy Block, 4.125 Inch Bore
Dart 31131211 Little M Chevy Block, 4.125 Inch Bore

Dart 31131211 Little M Chevy Block, 4.125 Inch Bore

Chevy Small Block V8

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Dart 31131211 Little M Chevy Block, 4.125 Inch Bore
Dart 31131211 Little M Chevy Block, 4.125 Inch Bore
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Part # 30431211
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For those wanting the ultimate cast iron small Chevy block, Darts Little M is your best bet. The Little M features extra thick stock deck heights, stock cam height, stock pan rails, 4 bolt steel main caps, and they are already clearanced for a 3.875" stroke. These blocks have the common 350 main journal diameter with a 4.125" bore size. Two-piece rear main seal.

304-31211 Instructions (PDF)

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Item Details

Steel Main Caps

Notes

Features:

  • Extra thick cylinder walls resist cracking and improve ring seal for more power
  • Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures
  • Priority main oiling system directs oil to the main bearings first for more dependable lubrication
  • Blind tapped head bolt holes prevent water leaks
  • Extra thick decks ensure reliable head gasket seal
  • Standard small block deck height allows use of off the shelf parts
  • Splayed outer bolts on middle main bearing caps prevent cracks
  • Open lifter valley improves return to oil pan
  • Enlarged lifter bosses accommodate offset and oversize lifters
  • 4-bolt billet steel main caps have splayed outer bolts for extra strength
  • Front and rear external oil inlets, crossovers and restrictor provisions to simplify plumbing with external pump
  • Block includes special coated cam bearings, freeze plugs and dowels

 

Some parts are not legal for use in California or other states with similar laws/regulations

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