Valve Seal Kit. KPMI® Red 100% Viton valve stem seals are designed to have optimum fitment, allow, maximum lift, and to give maximum life. KPMI® Red valve stem seals are resistant to high temperatures, petroleum products and the corrosive gasses that are the by-products of combustion. These seals retain their ability to seal in situations where other materials could harden and allow oil to enter the combustion chamber causing detonation, carbon build-up and a loss of power. The Red Ones are truly the racer's choice. Detailed Specifications: Type: Intake / Exhaust. Material: Red Viton®. Seal style: 4. Quantity: 2 Intake Seals / 2 Exhaust Seals. Intake stem diameter: 5.0 mm. Intake overall length: 0.350". Intake seal O.D.: 0.405". Intake (A): 0.340” ±0.005”. Intake (B): 0.303". Intake (C): 0.125".