I've got a Continental diesel in a small Oliver crawler (OC3 with a ZD-129 Continental). Four cylinder and probably quite different than your's.
Regardless - heat works on freeing just about any ferrous metal parts (ferrous metal in ferrous metal). Not so good if aluminum is involved, or stainless steel.
I've had to removed a lot of stuck glow plugs. I just had the head off a GM 6.2 V8 with a plug that snapped right off. Came out fine once I was able to get close to it with a torch and heat it. Steel glow plug in a cast-iron head. With exhaust manifold bolts? Most stuck bolts I've come across had the bolt shanks stuck in the manifold. The actual threads in the head were not the issue. Again heat worked well. I had one recently where the bolt heads were so corroded no wrench would fit them anymore. I just cut the heads off. I still had to head the manifold to get it off. Once away from the had, the remains of the bolts came out easily.
Note - I'm talking about water-cooled engines. Air-cooled tend to get the exhaust manifold bolt threads stuck something awful.
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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