Brian Tooley Racing BTR Valve Covers for Gen III IV LS EnginesBTR valve covers retain stock mounting height and allow the use of OE style GM gaskets and bolts, while being molded in a unique plane to allow nose clearance for shaft rockers. With 12AN ORB vents on both ends, you have a wide variety of options for catch can or vacuum pump plumbing. Also featured is a unique baffle design splash guard that protrudes below the valve cover surface. Die cast aluminum and available in 3 colors silver, black, red with