The Ovate Wire Valve Spring Kit for Jeep 4.0L 1988-06 Applications supports the installation of up to .450" lift high performance cams. Featuring properly engineered valve springs that handle harmful dynamic valve train stress more efficiently, this kit increases greater RPM potential and durability. This spring upgrade also eliminates valve float issues associated with the stock valve springs. Includes the COMP Cams #983 Ovate Wire Valve Spring and #516 valve seals, this kit allows the re-use of stock retainers.