LS Exhaust Gasket O-Ring Cutting ToolNever fight sharp, gnarly exhaust gaskets again. This bolt on, manual groove cutter brings machine shop precision to your garage so you can cut O ring grooves on LS cylinder heads quickly, accurately, and repeatably saving teardown, shipping, and shop labor. Quick pitch: Bolt the jig to your exhaust flange holes, rotate the inner cutter with a 3 4" socket and ratchet, check depth often, and walk away with a perfect O ring groove sized for reusable