Anvil now offers carbon fiber valve covers for popular domestic V8 engines, like these for GM LS series engines. These CAD designed, 100% carbon fiber valve covers are made in the U.S.A. by Carbon Fiber Innovations using a proprietary method that produces the best valve covers on the market. The carbon fiber shells are bonded onto aluminum frames for the ultimate strength and rigidity. Benefits over ordinary stamped steel or cast aluminum valve covers include: Low heat transfer, lightweight, rigid, killer looks! See more at http://www.anvilauto.com .