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Return to Parts List Category : D- Big Block (Low Deck) : Cylinder Heads HUG OEM-IRON-STREET-PORT STREET PORTING TO CUSTOMER IRON HEADS $2106.23  Using customer supplied OEM iron castings. '906-'452, etc. We clean, shot blast, crack check, pressure test, install bronze guides for light weight 2.140" intake valves, 1.810" exhaust valves with 11/32" stems. Hot street porting, racing valve job, positive valve stem seals, HUG 1106 springs, chrome moly retainers, locks, and milled level.