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®. Stem diameter: 5.5 mm. Overall length: 0.330". Seal O.D.: 0.455". A: 0.365" ±0.002”. B: 0.325". C: 0.120". D: 0.235". O.E.M. reference P/N: 51Y-12119-00-00.