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Re: 250 integral head - replace exhaust manifold?
When I disassembled mine for a rebuild, many (most) of the bolts that held the exhaust manifold in place snapped off. Since I was going to old style (non-integrated head) it didn't bother me as much. Not sure how you could pre lube/penetrating oil on them to lessen that chance. The last time I did one was 30 years ago and I remember the bolts breaking off that one also. That is the only issues I have seen with the exhaust manifold.
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