Avenger 370cc A356 aluminum heads fully CNC, 122cc combustion chamber, REV 2.30 x 1.90 stainless steel valves, PAC 1.625 dual valve springs with .850 lift, 11/32" valve stem, flow 441 @. 850 intake / 350 @ .850 exhaust, chromoly retainers, bronze valve guides, stock intake and .375 raised exhaust port locations, race radius valve job, fully assembled, sold as a pair, new, 2800.00