Here’s some pics of a 3406 Caterpillar cylinder head we rebuilt. The 3406 is one of the most popular diesel engines we’ve done machine work to over the years. The cylinder head was disassembled, cleaned, magnafluxed for cracks, fully inspected & pressure tested before any machine work was done. After everything checked out okay the valve seats were machined, the valves ground & the surface was milled flat & square on our multipurpose cnc boring & milling machine. Final assembly & it’s ready to get back to truckin’.Motor Mission Machine & Radiator(702) 649-2366