Avenger A356 aluminum heads fully CNC, 180cc intake port, 73cc combustion chamber, ProFlo 2.19 x 1.71 stainless steel valves, 3/8" valve stems, 1.550 dual valve springs, flows 321 @ .700 intake and 267 @ .700 exhaust, bronze valve guides, stock port locations, race radius valve job, fully assembled, sold as pair. new, 2000.00