Chevy Small Block
M Sportsman, 350 mains, 9.025" deck, 4.000" or 4.125"
block shares most of the Little M's best features, but saves you
money by using ductile iron main bearing caps (4 bolt on the center
three and 2 bolt on the ends), and employing a rear external oil
feed, crossover and restrictor provision.
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.
Nodular iron main bearing caps. Utilizes standard pan, oil pump
and two piece seal.
Rear external oil feed, crossover and restrictor provision.
Cam bearings, freeze plugs and dowels are not included.
Dart blocks are available fully finish prepped