Dart 31223544 – Cast Iron Big M Sportsman Engine Block Chevy Big Block 9.800 Deck, 4.560 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 9.800” and 10.200” and bore sizes up to 4.600”, 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: Superior iron alloy
Bore: 4.560″ (unfinished)
Bore/Stroke: 4.625″ x 4.500″ (max recommended)
Cam Bearing Bore ID: 2.120″
Cam Bearings: Specially-coated & grooved with three oil holes #32210030
Cam Bearing OS: +.010″, +.020″, +.030″
Cam Bearing Press: .002″
Cam Plug: 2.215″ shallow cup
Cylinder Wall Thickness: .300″ minimum @ 4.624″ bore
Deck Height: 9.800″
Deck Thickness: .625″ minimum
Fuel Pump: Mechanical pump provision
Fuel Pump Pushrod: STD BBC
Freeze Plugs: Press-in cup plugs 1-5/8″
Lifter Bores: SBC .8427″ to .8437″ +.300″ taller Gen V, VI style
Main Bearing Size: STD. BBC
Main Bearing Bore: 2.937″-2.983″
Main Caps: Ductile, 4 bolt, center 3 Splayed
Main Cap Register: Deep stepped register on each side (no need for dowels)
Main Cap Press: .005″
Oil System: Wet sump, main priority oiling (can use dry sump)
Oil Pump Shaft: BBC shaft with wet sump
Oil Filter: Stock location
Oil Pan: Standard Pan rails
Rear Main Seal: Standard 2 piece Felpro 2918
Serial Number: On main caps and left front
Starter: Standard BBC
Stud Hole/Head: Blind holes
Timing Cover: Can use stock stamped steel or plastic
Torque: All 1/2″ bolts 105lbs
Weight: 4.560″-270lbs
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