[Geoffjake?]

I checked around the injectors for black death as the injector seals on this model are prone to leaking ,I noticed one of the injector clamp bolts was bigger than the rest ,I suppose the threads have been stripped out ,so an over size thread was tapped into the head ,the bolts are stretch type and have to be replace when removed ,my question is should I replace this bolt when I remove the injector ,and what amount of torque should I tighten it up to ,thanks for any advice ,by the way I live in England but I think Austraila is a wonderful country