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well here is the update .. pulled the head off . machined the head fitted new valves and hardened seats radiator replaced with a brass copper one . water pump , all back together and working fine .. had just the slightest mark on the head gadget around Number 5 cylinder . reco pump injectors ,, All fine no more problems .. The valves were receding into the head .. so fitted hardened seats . the head was still flat so just took the barest minimum to clean it up . . all good