This follows the OEM redesign for valve cover gasket and protects the PCV orifice from excess oil, possibly thrown up by crank reluctor wheel. In these early 3.6L V6 GM engines (mine is 2008), a working PCV system is critical to help prevent sludge. The Felpro design has three ports in a cover to allow crankcase blowby gases to escape while helping prevent oil loss. These engines suffer from "stretched" timing chains. They also have very fine channels in the VVT (Variable Valve Timing) system driven by oil pressure. Sludge is extremely harmful to both, along with any compromised or dirty oil. Maintaining a shorter-than-recommended oil-change interval with synthetic oil and anti-drain-back filter, along with this improved gasket, gives one a reasonable chance at longer engine life, all things equal. Both my gaskets seem high quality with perfect fit and presumably excellent seal against oil and vacuum leaks over time. Good luck.