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3 To make things easy for the DIY’er, RHS sells complete head assembly kits with everything necessary to equip a bare cylinder head. Our kit is PN 12987, and comes with hydraulic roller dual valvesprings, steel retainers and 10-degree locks, plus-0.100 inch length stainless steel valves, valvespring seat inserts, and steel jacketed high-temp Viton valve stem seals. There are also kits for flat tappet cams, and a kit that comes with beehive design valvesprings if you so desire. Or, you can select the parts individually to better suit your application.