Avenger A356 aluminum heads fully CNC, 310cc intake port, 92cc combustion chamber, REV 2.25 x 1.71 stainless steel valves, Pacific 1.550 dual valve springs, heads flow 350 @ .750 intake / 261 @ .750 exhaust, bronze valve guides, stock intake and raised .250" exhaust port locations, race radius valve job, fully assembled, sold as pair, new, 2300.00