Manley rotating assembly for BBC 572 (4.250 stroke / 4.625 / +43cc). This complete, matched system pairs a precision-forged crank with 4340 H-beam connecting rods and 2618 forged aluminum pistons to deliver strength and balance for high-demand engines. Premium chrome-moly wrist pins and a 4340 forged crankshaft reduce friction and improve load handling; ARP fastener options support roughly 900–1,500 hp.
Manley Rotating Assembly, BBC 572 4.250 STROKE/4.625/+43cc