Avenger Xtc 'R' cylinder head full Cnc, 280cc intake ports, 70cc combustion chamber, Rev 2.22 x 1.67 stainless steel valves, Pac 1.625" dual valve springs w/ max. .810" lift for solid roller camshaft, heads flow 406 @ .850 intake / 275 @ .850 exhaust, race radius valve job, Manley titanium retainers, bronze valve guides, will fit 302 boss / 351c / 351w - clevor set up, shown with optional water-cross over bung welded into head for radiator, fully assembled, sold as pair....... call for shipping rates, ask about optional springs, valves, retainers and rockers.