Description Reviews Supertech MINI Cooper Exhaust Valves ONLY. The correct valve can make or break an engine build just like the correct piston. This set will build your motor to be built proof! Std or over sizes set of 8, just don't forget the keepers. Make sure you pair it with all of the other Supertech items like the, valve springs, valve seals, and valve guides! Need just 1 valve as a replacement? Give us a call. Stock: Inconel Exhaust Valve MCEVI-1200-HS Head Diam: 26.20mm Stem Diam: 4.95mm Length: 110.15mm Material: Inconel Comment: Sodium filled single groove Valve Type: Exhaust Over sized: Inconel Exhaust Valve MCEVI-1202-HS Head Diam: 27mm (+0.8)mm Stem Diam: 4.95mm Length: 110.15mm Material: Inconel Comment: Sodium filled single groove Valve Type: Exhaust