The Dart Big M big block Chevy cast iron bare blocks no-compromise design solves the problems that have plagued big blocks for the years. The Dart Big M features extra-thick cylinder walls, and are available with a choice of different deck heights and cylinder bores, so there's sure to be a Big M block for you to build a better big block to suit your needs. Dart Big M Big Block Chevy cast iron bare blocks feature: * Standard 9.800 in. and tall 10.200 in. deck heights available * 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 bearing caps are manufactured in-house by Dart to ensure quality and compatibility with the block * Dual oil pan bolt patterns fit standard and notched oil pans
The Dart Big M big block Chevy cast iron bare blocks no-compromise design solves the problems that have plagued big blocks for the years. The Dart Big M features extra-thick cylinder walls, and are available with a choice of different deck heights and cylinder bores, so there's sure to be a Big M block for you to build a better big block to suit your needs. Dart Big M Big Block Chevy cast iron bare blocks feature: * Standard 9.800 in. and tall 10.200 in. deck heights available * 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 bearing caps are manufactured in-house by Dart to ensure quality and compatibility with the block * Dual oil pan bolt patterns fit standard and notched oil pans

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