The Little M is cast from premium high strength iron and beefed up in all the critical areas. A competition oiling system ensures adequate lubrication to the main bearings at high rpm. You can select 4.000" or 4.125" cylinder bores, and 350 or 400 main bearings with steel 4 bolt main caps. Front and rear external oil feed, crossover and restrictor provision simplify plumbing with external pumps.

With a standard deck height, extra thick siamese cylinder walls and a competition oiling system, the Little M is the perfect starting point for a powerful and reliable engine for the street or the race track.

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.
• 400 Mains
• 4.00 Bore