I've always had good luck over the years with stainless steel bolts for holding the manifold against the head. Since we're no talking about a lot of torque and Rover makes those god awful lock washers, stainelsss steel is more than strong enough for the job. I've never had a problem with removing a stainless steel bolt in this application. So, next time you need to pull the manifold you might want to consider stainless steel bolts instead of plain steel.
As far as removing the nuts from the studs on the down pipes,a great way to avoid snapping the stud is to use an impact gun. When you use a conventional wrench or ratcheting wrench you are continually building up torque as you try to remove the nut. The likelihood of breaking the stud is far greater. When you use an impact gun, usually, the worst thing that happens is you remove not just the nut but the whole stud.
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