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Build a powerful and durable engine at an affordable price.

The new Dart Special High Performance Chevy small block engines are manufactured from high-nickel iron for superior strength and feature siamese cylinders with 4.000 or 4.125 in. bore sizes. The cylinder walls are a minimum of .230 in. thick at a 4.165 in. bore. The Dart Special High Performance blocks are machined using precision, digital CNC equipment and are virtually ready to assemble right out of the box after a final cylinder hone. The decks are even and parallel within .002 in., and the lifter bores, cam, and main tunnels are finished. The Dart Special High Performance blocks are designed for compatibility with stock components, so no costly special parts are required for assembly.

• Main Journal Type 350 mains
• Engine Block Style Aftermarket
• Deck Height (in) 9.025 in.
• Cylinder Bore as Shipped 4.000 in.
• Engine Block Material Cast iron
• Engine Block Weight (lbs) 175 lbs.
• Main Bolt Style 4-bolt
• Main Caps Included Yes
• Main Cap Material Steel billet
• Main Cap Fasteners Included Yes
• Main Bearings Included No
• Rear Main Seal Style 2-piece
• Finished Cylinder Bores No
• Raised Cam Location Yes
• Cam Bearings Included No
• Freeze Plugs Included No
• Notes Uses 1981 - 1985 stock style oil pan and dipstick. DRT-32210020 cam bearings are required.