Dart's Little M block 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 a 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 perfrect 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 bearing 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 & dowels.

Specs:

•Main Journal Type: 350 mains
•Engine Block Style: Stock/OEM standard deck
•Deck Height (in): 9.025 in
•Cylinder Bore as Shipped: 4.125 in
•Maximum Cylinder Bore Diameter: 4.185 in
•Engine Block Material: Cast Iron
•Main Bolt Style: 4-bolt
•Main Caps Included: Yes
•Main Cap Material: Steel billet
•Main Cap Fasteners Included: Yes
•Main Bearing Included: No
•Rear main Seal Style: 2-piece
•Finished Cylinder Bores: Yes
•Raised Cam Location: No
•Cam Bearings Included: Yes
•Freeze Plugs Included: Yes