Dart 31223654 – Cast Iron Big M Sportsman Engine Block Chevy Big Block 10.200 Deck, 4.600 Bore, Ductile Caps
Dart engineered the Big M to be the strongest, most reliable, and easiest to build big block on the market.
With deck heights of 9.800โ and 10.200โ and bore sizes up to 4.600โ, the Big M gives you the versatility to build a wide variety of engine combinations.
The Big M is fitted with Billet Steel 4-bolt main caps for ultimate bottom end strength. The Sportsman block is fitted with Ductile Iron 4-bolt main caps.
Material:ย Superior iron alloy
Bore:ย 4.600″ (unfinished)
Bore/Stroke:ย 4.625″ x 4.750″ (max recommended)
Cam Bearing Bore ID:ย 2.120″
Cam Bearings:ย Specially-coated & grooved with three oil holes #32210030
Cam Bearing OS:ย +.010″, +.020″, +.030″
Cam Bearing Press:ย .002″
Cam Plug:ย 2.215″ shallow cup
Cylinder Wall Thickness:ย .300″ minimum @ 4.625″ bore
Deck Height:ย 10.200″
Deck Thickness:ย .625″ minimum
Fuel Pump:ย Mechanical pump provision
Fuel Pump Pushrod:ย STD BBC
Freeze Plugs:ย Press-in cup plugs 1-5/8″
Lifter Bores:ย SBC .8427″ to .8437″ +.300″ taller Gen V, VI style
Main Bearing Size:ย STD. BBC
Main Bearing Bore:ย 2.937″-2.983″
Main Caps:ย Ductile, 4 bolt, center 3 Splayed
Main Cap Register:ย Deep stepped register on each side (no need for dowels)
Main Cap Press:ย .005″
Oil System:ย Wet sump, main priority oiling (can use dry sump)
Oil Pump Shaft:ย BBC shaft with wet sump
Oil Filter:ย Stock location
Oil Pan:ย Standard Pan rails
Rear Main Seal: Standard 2 piece Felpro 2918
Serial Number:ย On main caps and left front
Starter:ย Standard BBC
Stud Hole/Head:ย Blind holes
Timing Cover:ย Can use stock stamped steel or plastic
Torque:ย All 1/2″ bolts 105lbs
Weight:ย 4.600″-280lbs
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