the engine was tired anyway and one of the rings lets go, presserised the sump and pumped the little amount of oil there was out.
when i stripped it i found some bearing were stuffed. prob my fault i was not the brightist back then. young dumb and too much money. my dad was very un- impressed.
anyway reassembled with ballanced crank (to remove groves) new ring and bearings and then traded for a Mk 3 GT Cortina.( blew that up as well)