Avenger A356 aluminum heads as cast, 290cc intake port, 92cc combustion chamber, RaceFlo 2.19 x 1.71 stainless steel valves, Pacific 1.550 dual valve springs, heads flow 328 @ .700 intake / 219 @ .700 exhaust, 3 angle valve job, bronze valve guides, stock intake and raised .250" exhaust port locations, sold as pair, fully assembled, new, 1500.00