Dart Engine Block Little M Pro Series Cast Iron 4-Bolt Mains 4.125 in 31131213
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Notes: Engine Block Little M Pro Series Cast Iron 4-Bolt Mains 4.125 in. Diameter Bore 2-Piece Seal Chevrolet
Overview Cast from premium high strength iron and reinforced in all critical areas, the Little M Pro block offers several cam upgrades and a lightening option to take the standard Little M design to the next level for the serious competition engine. Features: Extra thick cylinder walls resist cracking and improve ring seal for more power (minimum .275 thick with 4.185 bore). True priority main oil system lubricates the main bearings before the lifters. Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures. Blind tapped head bolt holes prevent water leaks. Extra thick decks ensure reliable head gasket seal. 4 bolt billet steel main caps have splayed outer bolts for extra strength. Open lifter valley improves return to oil pan. Enlarged lifter bosses accommodate offset and oversize lifters.