Description Reviews Supertech MINI Cooper N14 Intake Valve ONLY. The correct valve can make or break an engine build just like the correct piston. This set will build your motor to be bulletproof! Std or oversized set of 8 with keepers. Make sure you pair it with all of the other Supertech items that you may need like, valve springs, valve seals, and valve guides! Need just 1 valve as a replacement? Give us a call. Stock: Black Nitrided Intake Valve MCIVN-1200S Head Diam: 28.80mm Stem Diam: 4.96mm Length: 105.80mm Material: Black Nitrided Comment: Single groove Valve Type: Intake Oversized: Black Nitrided Intake Valve MCIVN-1201S Head Diam: 29.80mm (+1mm) Stem Diam: 4.96mm Length: 105.80mm Material: Black Nitrided Comment: Single groove Valve Type: Intake