2002-2006 Nissan Altima, Sentra 2.5L I4 Engine Code QR25DE Multi-layered Steel Full Head Gasket Set and Head Bolts Multi-layered steel (MLS) head gasket - 10 Head Bolts Intake manifold gasket - Camshaft front - Silicone sealant Exhaust manifold gasket - Front seal gasket - Timing cover gasket Valve cover gasket - Water pump gasket Viton valve stem seals - Rear seal gasket