Complete (New) Upgraded High Performance Valve & Shim Conversion Kit. Easy to install, easy to use! Works with stock and after market valves. Adjust your engine valve clearance using commonly available shims 9.48mm shims. 8 DLC coated buckets. 8 DLC coated retainers. 4 Upgraded forged intake valves. 4 Upgraded forged. 8 High temp valve stem seals. Shim kit (includes all sizes). Fits the following applications. Rev6 offers quality parts that are proven to last.