virden Posted August 30, 2014 Share Posted August 30, 2014 One of the studs holding the manifold for no.2 & 3 cylinders has disappeared and on checking it looks like the thread has been stripped within the head. How can I fix it, with a nut and bolt or do I have to drill the whole thing out and fit a larger stud. If the latter, does it have to be a special heat resisting stud? Link to comment Share on other sites More sharing options...
Roger King Posted August 30, 2014 Share Posted August 30, 2014 You need to have the cylinder head helicoiled. This should be easy to do in situ without removing anything except the exhaust. Fitting oversize threads can create problems with clearances and you would also have to enlarge the hole in the exhaust flange. The thread you need is 5/16" UNC and this will take you back to the original specification. It would be worth running a tap down the existing thread to clean it up first, just in case you don't have a stripped thread after all. Link to comment Share on other sites More sharing options...
Crumpynut Posted August 30, 2014 Share Posted August 30, 2014 Agree 100% with the above, somebody bodged my head before I bought the car so one Manifold bolt is now bigger than the others. Helicoil is the way to go. Link to comment Share on other sites More sharing options...
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