Valve Cover BreatherApplications: All K series engines Notes: Inlet I. D. 0. 75in Overall Height 2. 5in Filter O. D. 2. 2in Specification: Use this valve cover breather filter to keep warm, oil saturated crankcase vapours from re entering your engine through the intake pipe. Allowing crankcase vapour to re enter the engine hurts performance and leaves a nasty oily residue all over the inside surface of the intake manifold. To prevent this, you can delete the factory