SpeedFactory Racing K20A/Z Forged Steel H-Beam Connecting Rods - SF-02-106SpeedFactory Racing K20 A Z Forged Steel H Beam Connecting Rods These rods are ideally suited to K20 A Z engine builds (K20, K20A2, K20Z1, K20Z3) to the 900+HP range and offer high strength and quality at an affordable price. Our design is strong enough for almost any K20 A Z build. The 2 piece forged 4340 chromoly construction provides outstanding strength and quality. Each rod is heat treated, magnafluxed, CNC machined, and shot peened to stress