M Chevy Small Block
M Small Block Little M, 350 mains, 9.025 deck, 4.000 or 4.125
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.
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
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
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.
Dart blocks are available fully finish prepped.