Everything needed to completely refresh/upgrade the cylinder head • Include lightweight racing valve spring kits with steel or titanium valve spring retainers, beehive or dual valve springs, steel base washers and rubber valve stem seals Black Diamond or White Diamond stainless steel valves for increased longevity (valves are standard size) C630 bronze valve guides (standard size) • Top end gasket kit including base gaskets, engine case gaskets, exhaust gaskets, head gaskets and necessary O-rings and washers (as needed per application)