Plumb just the front of your heads with Trick Flow® GM LS engine steam line plumbing kits. It's an easy upgrade from factory steam tubes. Your GM LS engine front-only plumbing kits include: * 2 ft. 1/4 in. black rubber hose * Six 1/4 in. hose clamps * Two 4 AN 90 degree fittings * Stainless steel tee barb fitting