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sbc 906 vortec heads undercover ported by high velocity heads hvh 2.00 intake valves 1.56 exhaust valves,combustion chambers valves are unshrouded,flat milled to 60 cc,intake runners hold 182cc of liquid,disquised very well nice work look untouched,double valve springs flat tappet,titanium retainers screw in studs and guideplates asking $1,000.00 thats half of what undercover porting alone cost