This is a full set of ZZPerformance high RPM lash adjusters, also known as lifters. These are short travel lash adjusters, specifically designed by ZZP and hand measured to promote high RPM valvetrain stability. We used these lifters in the Drag Sonic which allowed us to safely rev over 8000rpm. A short travel lash adjuster prevents full lifter collapse, without the complications of a solid lifter. With these lifters you will see a smoother power curve above 6000rpm. See attached dyno sheet of Tim's Z04 Sonic for differences in power from the lash adjusters on an all out build. 

Fits: 1.4L LUV/LUJ/LUH.