Michigan Motorsports Stock Replacement 1.550" LS Exhaust Valves -Fits Cathedral Port 243 799 706 862 317 241 853 806 Heads LS1 LS2 LS6 LQ4 LQ9 LC9 LMG LM7 (8)

These Michigan Motorsports stock replacement LS exhaust valves are engineered for cathedral port LS cylinder heads requiring a standard 1.550 inch exhaust valve. Designed to restore factory valvetrain function, these valves provide proper sealing, heat resistance, and durability for daily-driven, work, and mild performance LS engines. Ideal for cylinder head rebuilds, valve replacement, or refresh projects, they maintain OEM-style dimensions and geometry to ensure correct valve seating and combustion efficiency. Built for reliability and long service life, these exhaust valves are a dependable solution for maintaining proper engine performance across a wide range of LS applications.

• Standard 1.550 Inch Exhaust Valves: Manufactured to factory LS specifications for correct valve sizing, seating, and exhaust flow performance.
• Cathedral Port Head Compatibility: Designed for LS cathedral port cylinder heads including common castings used in Gen III and Gen IV LS engines.
• OEM-Style Replacement Design: Ideal for head rebuilds and repairs where factory valve geometry and fitment must be retained.
• Durable Valve Construction: Built to withstand exhaust heat and repeated thermal cycling for long-term reliability.
• Wide LS Engine Fitment: Compatible with multiple LS engine platforms commonly used in cars, trucks, and performance builds.