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 - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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