Bore Size: 4.500 Deck Height: 9.800
With extra strengthening in critical areas, increased displacement capacity, true priority main oiling and precision CNC machining, these new 140-pound aluminum big-blocks are the choice for serious competition.Dart's new Aluminum Big M block is a conventional configuration that retains all production dimensions. It is manufactured from virgin C355-T61 aerospace aluminum alloy and machined in-house by Dart technicians to ensure absolute quality.
Dart aluminum blocks feature ductile iron sleeves with extra-thick walls that promote excellent ring seal. Reinforcing ribs strengthen the lifter valley and bellhousing flange, and inboard head stud bosses clamp down on head gasket leaks. The priority main oiling system delivers oil directly to the crankshaft bearings to enhance reliability at high engine speeds.
Includes coated cam bearings, freeze plugs and dowels.