The BMW M2 F87 takes over the N55B30 of the M235i, raised to 370hp, and draws on exactly the same stock of uprated parts. The rotating assembly is built around ZRP and MANLEY forged connecting rods,…The BMW M2 F87 takes over the N55B30 of the M235i, raised to 370hp, and draws on exactly the same stock of uprated parts. The rotating assembly is built around ZRP and MANLEY forged connecting rods, JE, MANLEY, WÖSSNER and DIAMOND forged pistons in 84 to 85mm, and ACL RACE and KING RACING tri-metal bearings available for big ends and main journals alike. On the head side, SUPERTECH and FERREA valves, SUPERTECH, FERREA and CATCAMS springs, SUPERTECH stem seals and collets in 5mm and 6mm. The ATHENA and COMETIC head gasket is listed for the N55B30 only.