Description
When you’re pushing your LS engine to its limits, stock exhaust valves become the weak link in your buildup. Manley’s Severe Duty exhaust valves are engineered to handle extreme heat cycles and high RPM abuse without degradation, ensuring consistent flow and reliability through extended racing seasons. Built from premium stainless steel, they resist corrosion and thermal fatigue while maintaining tight tolerances that stock valves simply can’t match.
- Severe Duty rating
- 1.575″ head diameter
- 0.3136″ stem diameter
- 4.923″ total length
- Stainless steel construction
- GM LS-Series fitment
- Set of 8 valves
- CNC-precision manufactured
- Bolt-on installation
- MPN: 11675-8






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