While building a new engine or rebuilding cylinder heads JDM Engineering uses Ford OEM Valve Stem Oil Seals. Most aftermarket seals are made from inferior materials. JDM only trusts OEM components for even the highest powered Modular engine applications like our Cobra Jet Mustangs making 1400+ HP!
Factory OEM Ford Part #F5LY-6571-A
Fits: 2007-2014 Shelby GT500 & 1999-2004 4.6L & 5.4L 4V Engines (Cobra, Navigator, Aviator)
