Black Sabbath War Pigs. Morning. Decided to have a look at engine one of the Nuts what holds on Exhaust Manifold just kept turning the thread must of gone. I removed the other 3 nuts and jammed at screwdriver behind Manifold and used force so nut moved on to next ring and then just unscrewed off. The cylinder head will have to come off then barrel as the screw thread is gone. Took side panels off bone dry the Clutch has rusted didn't either have a Gasket on to stop water entering. I am missing the Push Rod and I don't think I have one. Will check rest of engine today if have time as I have my son arriving from Wales to help empty Attic. Take care.