Set of GM/Chevrolet small block heads. Thoroughly cleaned and inspected. Pressure tested to ensure no cracks or leaks. 3 ANGLE Valve job / Pocket Ported under valve seats. Umbrella seals. CBN milled to ensure straightness within .0015" and correct finish. All machine work were performed on the latest state of the art equipment by professional machnine shop specialist. Heads are machined with new hardened exhaust seats for unleaded fuel. Never installed. Air-tight and water-tight stored. Only opened to take pictures. Will fit 283, 305, 327, 350, 383, 400 small block engines. Casting number on the block 482824, ready to install. $450.00, call 386-574-2759.