This Valve Spring Compressor Tool Is Compatible With Ford Modular 2-Valve (2V) Engines, Including 4.6L V8, 5.4L V8, and 6.8L V10 Applications Produced From 1991 to 2004. Engineered To Provide Reliable Valve Spring Compression, It Allows Quick Removal And Installation Of Valve Keepers, Retainers, And Valve Stem Seals Without Removing The Cylinder Head.