Dart 31131111 Little M Chevy Block, 4.00 Inch Bore
350 Chevy Small Block V8, 383 Chevy Small Block V8, 395 Chevy Small Block V8
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 4.00" bore size. Two-piece rear main seal.
304-31111 Instructions (PDF)
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Item DetailsSteel Main Caps
- 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
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