Dart Little M2 Sportsman Engine Block, Small Block Chevy 4.000" Bore, 350 Main
Part# 31191111 (Sportsman)
Material: Superior iron alloy
Bore: 4.00” unfinished
Bore & stroke: 4.185” x 4.000"
Cam bearing bore ID: SBC - 2.00”
Cam bearings: Special coated, grooved, w/3 oil holes (Not included)
Cam Bearing O.S. + .010”, +.020”, +.030”
Cam bearing press: .002”
Cam journal OD: Standard SBC - 1.869”
Cam Plug: 2.375” dia. Cup plug
Cylinder Wall Thickness: .275”min @ 4.185” bore
Deck Height: 9.025”
Deck Thickness: .675” min.
Fuel Pump: Mechanical pump provision
Fuel Pump Pushrod: Standard Length
Freeze Plugs: Press in cup plugs
Lifter Bores: SBC .8427” - .8437”
Lifters: Must use +.300” tall lifters if using link bar lifters
Main bearing size: 2.450” (350)
Main bearing bore: (350) 2.6401” / -.001”
Main Cap bolts: Comp - 7/16” & 3/8” dia. Sportsman – 7/16”dia.
Main Stud Kit: Dart PN# 66311400
Main Bolt Kit:
Main cap press: .005”
Main caps: Sportsman – Ductile 2 bolt front & rear. 4 bolt on middle caps
Main cap register: Deep stepped register on each side (no need for dowels)
Oil system: Wet Sump - Priority main oiling (can use dry sump)
Oil Pump shaft: 350 main = Stock shaft (.481”OD)
Oil Filter: Standard SBC filter and uses 2 bolt filter adapter.
Oil Pan: Standard SBC oil pan
Rear Main Seal 350 main - STD seal
Serial No. Left front & main caps
Starter: Standard SBC
Stud holes, Head: Blind holes
Timing chain/gears Standard SBC
Timing Cover: Can use stock style cover
Torque Specs: Comp - 1-5 7/16” bolts - 65 ft lbs 1 & 5 3/8” bolts 35 ft lbs
w/ high pressure lube Sportsman – 1 – 4 7/16” bolts – 65 ft lbs Rear – 1/2” bolts 100 ft lbs.
Weight: 90-93kg
True race block which will work with most standard components. Provisions for wet or dry sump oiling systems. Great for power adders and maximum effort engines.
The Dart Little M2 is designed from the ground up as a true racing engine block which can be used with standard off the shelf small block components.
The Little M2 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.
FEATURES
• Uses standard small block parts, including cam, oil pump, oil pan, oil filter, motor mounts, mechanical fuel pump, and clutch linkage.• Priority main oiling system feeds main bearings first.
• Center lifter oil crossover for improved lifter oiling.
• Siamese cylinder bores with extra thick walls resist cracking and improve ring seal for more power (minimum .275” thick with 4.185” bore).
• Open lifter valley improves oil return to pan.
• Enlarged lifter bosses accommodate offset and oversize lifters.
• Blind head bolt holes don’t go through to water jacket.
• Billet steel 4-bolt main bearing caps on all 5 mains.
• Standard oil pan rail width
• Oil gallery holes machined for o-ring plugs.
• Parts kit included