The Manley rotating assembly for BBC 555 (4.250" stroke, 4.560" bore) is a fully matched crank, rod, and piston package engineered for high-stress engines. It combines precision-forged crankshafts with 4340 H-beam connecting rods and 2618 forged aluminum Platinum Series pistons, with ARP cap screw options. Tight tolerances and careful material selection reduce friction and improve load handling for demanding builds.
Manley Rotating Assembly, BBC 555 4.250 STROKE/4.560/-3cc