detailed specification Manufacturer: FCP Engineering Model: FCPRH150856822 Profile: H beam Center spacing: 150.80mm Crankshaft sleeve diameter: 56.80mm Piston sleeve diameter: 22mm Quantity: 6 pcs, 12 pcs. ARP2000 3/8" screws Material: steel forged 4340 EN24er Declared power: 1000 HP (6 cylinders) Declared revolutions: 9000 rpm Audi RS4 - 3.0 Stroker V6 Biturbo These connectors can be used with FCP pistons and a 3.0 liter crankshaft.