4.000" Bore, 9.025" Deck, 350 Mains


The Little M Sportsman small block is an affordable high performance racing piece. Designed with ductile iron main caps and the capability to accept most standard small block parts, it makes an ideal option for the serious racer who doesn't want to spend a fortune on an engine block. Dart's Little M Sportsman block is the affordable alternative for sportsman racers and serious street performance. The Sportsman block shares most of the Little M's best features, but saves you money by using ductile iron main bearing caps (4-bolt on the center three and 2-bolt on the ends), and employing a rear external oil feed, crossover and restrictor provision.



  • 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.
  • Nodular iron main bearing caps. Utilizes standard pan, oil pump and two piece seal.
  • Rear external oil feed, crossover and restrictor provision.
  • Cam bearings, freeze plugs and dowels are not included.