Avenger A356 aluminum heads fully CNC, 205cc intake port, 58cc combustion chamber, ProFlo 2.05 x 1.60 stainless steel valves, Pacific 1.460 dual valve springs, heads flow 315 @ .700 intake / 235 @ .700 exhaust, bronze valve guides, heads fit 289, 302, 351W, stock port locations, sold as pair, race radius valve job, fully assembled, new, 1500.00