Dart SHP Small Block Chevy Cast Iron Bare Engine Block, 4.125" Bore, 350 Main

Dart SHP Small Block Chevy Cast Iron Bare Engine Block, 4.125" Bore, 350 Main

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Dart SHP Special High Performance Small Block Chevy Cast Iron Bare Block

Part# 31161211 (350 main)
Material: Superior iron alloy
Bore: 4.125” unfinished
Bore & stroke: 4.165” x 4.000” max with clearance machining & small
base cam.
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: 2.106” dia. Cup plug
Cylinder Wall Thickness: .230”min @ 4.165” bore
Deck Height: 9.025” +.005”to .008”/ – 0.00”
Deck Thickness: Thick decks for optimal head gasket sealing
Fuel Pump: Mechanical pump provision
Fuel Pump Pushrod: Standard Length
Freeze Plugs: Press in cup plugs
Lifter Bores: SBC .8427” - .8437” (Required .300” taller lifters)
Lifters: Designed for factory 87-95 Hyd rollers, Must use +.300”
taller lifters if using link bar lifters
Main bearing size: 2.450” (350) 
Main bearing bore: 2.6405” – 2.6415” (350) 
Main Cap bolts: #1 - #5 7/16” & #2, #3, #4 3/8” Splayed
Main Stud Kit: Dart PN# 66311110
Main cap press: .005”
Main caps: Ductile Iron
Main cap register: Deep stepped register on each side (no need for dowels)
Oil system: Wet Sump - Priority main oiling
Oil Pump shaft: 350 main = Stock shaft (.481”OD)
400 main = Stock shaft (.425”OD) MUST machine
aftermarket shaft
Oil Filter: Standard SBC filter and uses 2 bolt filter adapter.
Oil Pan: Standard 1980-1985 SBC oil pan. 1986 and up for 1pc. seal
Rear Main Seal 350 main - STD seal (Fel-Pro 2900)
Serial No. Left front & main caps
Starter: Standard SBC
Stud holes, Head: Blind holes
Timing chain/gears Standard SBC components, with 91-02 vortec thrust plate
Timing Cover: Can use stock cover or late model vortec cover will work.
Torque Specs: #1-#5 7/16” bolts – 65 ft lbs w/CMD #3
#2, #3, #4 3/8” bolts – 35 ft lbs w/CMD #3
Weight: 175 lbs @ 4.000” bore

Designed for high performance and medium duty applications, the SHP (Special High Performance) block is the ideal starting point for hot rodders, drag racers, circle track competitors, off-roaders, and high performance marine enthusiasts.
Don’t waste your valuable time sourcing, cleaning, machining and prepping a 40 year old core when you can have a brand new precision machined block with all the most desirable features for just a few dollars more.


• Priority main oiling system.

• Siamese cylinder bores with extra thick walls.

• Optional full water jacketed non-siamese cylinder bores.

• Extra thick decks ensure reliable head gasket seal.

• Blind head bolt holes don’t go through to water jacket.

• Scalloped water jacket walls improve flow around cylinders for better cooling.

• Clearance for 3.750” stroke with steel rods.

• Splayed outer bolts on middle main bearing caps.

• Non-siamese water blocks have 2-bolt mains on all 5 locations.

• Uses + .300” tall stock 87-95 roller lifters.

• Provisions for OE stock roller lifters & cams.

• Uses 1981-1985 stock style oil pan & passenger side dipstick.

• Uses stock stamped steel or plastic timing cover.

• All OE bolt holes for starter, clutch ball, etc.

• Oil restrictors available through aftermarket resources.

• Parts kit sold separately (PN 32000013)