BBC IR/BLK S 9.8004.500 NO KIT +.400 RC

Dart engineered the Big M2 to be the strongest, most reliable, and easiest to build big block on the market. It features a 9.800” deck height, 4.500” bore size (max bore 4.625”), and siamesed extra thick cylinder walls for exceptional durability. Designed for performance, it uses +.300” tall Gen VI style lifters and incorporates a true priority main oil system with a stepped main oil gallery and front oil crossover. The cam location is raised +.400” for improved valvetrain geometry, and it includes dual oil pan bolt patterns to fit both standard and notched oil pans. Constructed from 220 BHN Cast iron, this block also comes with a parts kit (PN 32000037).