Thunder Racing recommends the use of a GM LS6 PCV system in order to reduce oil consumption issues associated with the factory LS1PCV system. This kit includes everything needed to do the conversion: LS6 Valley Cover, valley
cover gasket, valley cover bolts, LS6 PCV Tube, and valve cover plugs. Some 1997-2000 engine blocks may require grinding for clearance of LS6 valley cover.