Cummins ISB 5.9L, 24 Valve, High Performance Exhaust Valve

Head Diameter: 1.299Stem Diameter: .2756Overall Length: 4.893Tip Length: .240Seat Angle: 45Years: 1998-2009
SBI diesel performance valves are a bimetallic design utilizing special processes which improve their overall durability and performance over stock valves.
Each valve is constructed using a premium-grade austenitic stainless steel head material on both the intake ( EV8 ) and exhaust ( EV16 ) with a mid-stem weld using a high-grade chromium steel stem material ( HNV3 ). Each valve is fully machined and nitrided all over, then polished. Each valve tip is hardened to a minimum of 50 HRc for added durability.
Premium-grade austenitic stainless steel head material on both intake and exhaust. High-grade chromium steel stem material on both intake and exhaust. Fully machined.  Special nitride processStrengthens entire valve and adds additional friction wear resistance. Polished stemBetter friction wear resistance and improved seal between valve stem and stem seal. Polished top of headOffers less carbon buildup. Nitride on seat face offers added wear resistance, hardness, and durability. Nitrided all over with a smooth black satin finish. Mid-stem weldSuperior durability over wafer tip for these applications.