Dart 31223344 – Cast Iron Big M Sportsman Engine Block Chevy Big Block 9.800 Deck, 4.250 Bore, Ductile Caps

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Dart engineered the Big M to be the strongest, most reliable, and easiest to build big block on the market.

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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.

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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.

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Material: Superior iron alloy
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Bore: 4.250″ (unfinished)
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Bore/Stroke: 4.625″ x 4.500″ (max recommended)
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Cam Bearing Bore ID: 2.120″
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Cam Bearings: Specially-coated & grooved with three oil holes #32210030
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Cam Bearing OS: +.010″, +.020″, +.030″
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Cam Bearing Press: .002″
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Cam Plug: 2.215″ shallow cup
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Cylinder Wall Thickness: .300″ minimum @ 4.625″ bore
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Deck Height: 9.800″
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Deck Thickness: .625″ minimum
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Fuel Pump: Mechanical pump provision
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Fuel Pump Pushrod: STD BBC
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Freeze Plugs: Press-in cup plugs 1-5/8″
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Lifter Bores: SBC .8427″ to .8437″ +.300″ taller Gen V, VI style
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Main Bearing Size: STD. BBC
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Main Bearing Bore: 2.937″-2.983″
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Main Caps: Ductile, 4 bolt, center 3 splayed
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Main Cap Register: Deep stepped register on each side (no need for dowels)
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Main Cap Press: .005″
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Oil System: Wet sump, main priority oiling (can use dry sump)
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Oil Pump Shaft: BBC shaft with wet sump
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Oil Filter: Stock location
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Oil Pan: Standard Pan rails
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Rear Main Seal: Standard 2 piece Felpro 2918
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Serial Number: On main caps and left front
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Starter: Standard BBC
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Stud Hole/Head: Blind holes
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Timing Cover: Can use stock stamped steel or plastic
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Torque: All 1/2″ bolts 105lbs
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Weight: 4.250″-250lbs

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