VTG Manley 99008 Honda CB750 Exhaust Valve 28mm Stainless NOS PerformanceVTG Manley 99008 Honda CB750 Exhaust Valve 28mm Stainless NOS Performance This is a rare, vintage Manley Performance 99008 Exhaust Valve for the Honda 750 series. It is a New Old Stock (NOS) item in its original vintage packaging. Unlike modern Manley parts with this number, this specific valve is engineered for the Honda 750 engine platform, likely for high performance or racing applications from the 1970s or 80s. Technical Specifications Part