BBC IR/BLK 10.400STD4.250 +.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 10.400” deck height, 4.250” bore (max bore 4.625”), siamesed extra thick cylinder walls, +.300” tall Gen VI style lifters, 4-bolt billet main bearing caps with splayed outer bolts, true priority main oil system with a stepped main oil gallery (9/16“ to 1/2“ to 7/16“) and front oil crossover, lifter valley head stud bosses, oil gallery holes machined for o-ring plugs, +.400" raised cam, dual oil pan bolt patterns, and is made from 220 BHN Cast iron. A parts kit (PN 32000037) is included.