Avenger XTC-R A356 aluminum heads fully CNC, 280cc intake port, 70cc combustion chamber, ProFlo 2.25 x 1.68 stainless steel valves, Pacific 1.625 dual valve springs, heads flow 404 @ .850 intake and 272 @ .850 exhaust, titanium retainers, 11/32" valve stems, bronze valve guides, solid roller set up, will bolt up to 302, 351C or 351W, sold as pair, race radius valve job, fully assembled, new 3500.00