Does your PCV valve match your engine? Stock PCV valves are not designed to work with modified high performance engines due to their altered vacuum profiles. A mismatched PCV valve can cause oil to push out of your breathers cause oil leaks or contaminate your oil with piston blow-by gasses.Now you can manage your crankcase pressure with this 6061-T6 billet aluminum dual-flow PCV valve. Once adjusted the valve will provide optimal crankcase ventilation during both idle and cruising speeds.This valve fits 3/4 ID valve cover grommets and 3/8 ID PCV valve lines. For 3/8 Inline applications use our optional DF1703 PCV Valve with Inline Adapter instead.Each Set includes:ValveVacuum gauge fittingAllen wrenchDetailed instructionsMade in USA {specs}