Before everyone discards their over skimmed heads, I can fully weld the entire head face and remachine the entire face, water ways and chambers to restore the head to as new!!!! It is'nt cheap but it does give new life to an otherwise scrap head!
I can of course recess valves and tip the valve stems for those heads that are around the 138.5mm area, but anything much below that needs the above welding work!