The K - series also feature a highly rigid aluminum
split -
crankcase engine block design with 4 - bolt mains with additional bolts securing the lower block, an internally balanced forged steel crankshaft with lightweight powder forged carbon steel connecting rods.
In GT3 configuration, this so - called «
split»
crankcase (meaning the parting line of
crankcase is on the crankshaft centreline) uses, instead of a fan and finned cylinders, separate water jackets added onto each side of the
crankcase to cool banks of three cylinders with water pumped through a radiator.