thank you all for the advice. will attempt to drill and use easy out in situ, space is really limited between manifold and rad but a right angle drill adapter might just do the job if i am very careful. the you tube vids are really good as guides to doing a never attempted job. the studs i have removed either came out really easy or just snapped off ( 2 in total ) level with the head surface. I have a set of stainless replacements waiting to go in if this works. If not I will have to remove the head so I have enough room to rectify the problem. will post on progress ( or lack of knowing my luck.) chris.
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