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Engine Block, Aluminum, 4-Bolt Mains, 4.600 in. Diameter Bore, 2-Piece Rear Main Seal, Chevy, Big Block, Each

Dart aluminum big block V8s deliver big power in a lightweight package. And, based on the Chevrolet big block V8 design, Dart's Big M Big Block Chevy aluminum bare blocks are the strongest, most durable and easiest to build aluminum blocks available--making them a top choice for serious competition!

Dart Big M Big Block Chevy Aluminum Bare Block features:

*Cast from virgin 355-T61 aerospace alloy for superior strength and integrity
• Standard 9.800 in. and tall 10.200 in. deck heights available (for stroker engines)
• Standard 4.250 in., 4.500 in. or 4.600 in. bore sizes
• Ductile iron sleeves with extra thick cylinder walls promote excellent ring seal
• Reinforcing ribs strengthen lifter valley bellhousing flange
• Inboard valley head stud bosses improve gasket sealing
• Priority main oiling system delivers oil directly to the crankshaft bearings to enhance reliability at high engine speeds
• Steel 4-bolt main caps with splayed outer bolts for extra strength (ductile iron or aluminum caps are also available)
• Dual oil pan bolt patterns fit standard and notched oil pans