phone: 316 775 7771

Dart Big M Sportsman BBC Cast Iron Bare Blocks #31223654

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What is the foundation for a better big block build? It's Dart's Big M Sportsman Big Block Chevy Cast Iron Bare Blocks of course! Dart engineered the Big M to be the strongest, most reliable, and easiest to build big blocks on the market. Hey, engine building is serious business--thankfully there's Dart! 

Part Type: Engines, Bare Blocks

Product Line: Dart Big M Sportsman Big Block Chevy Cast Iron Bare Blocks

Main Journal Type: OEM

Engine Block Style: Aftermarket/OEM tall deck

Deck Height (in): 10.200 in.

Cylinder Bore as Shipped: 4.590 in.

Cylinder Bore Diameter: 4.600 in.

Engine Block Material: Cast iron

Engine Block Weight (lbs): 250 lbs.

Main Bolt Style: 4-bolt

Main Caps Included: Yes

Main Cap Material: Ductile iron

Main Cap Fasteners Included: Yes

Main Bearings Included: No

Rear Main Seal Style: 2-piece

Finished Cylinder Bores: No

Raised Cam Location: No

Cam Bearings Included: No

Freeze Plugs Included: No

Quantity: Sold individually.

Notes: Block bores are .10 undersized to allow for piston set up.


Call 316-775-7771 to purchase.


WARNING: This product contains a chemical known to the State of California to cause cancer and reproductive harm. See for details.