My '72 F600 with 330 CID has badly rusted exhaust manifolds which leak a lot. I am told that the studs are easily broken and installing new ones is the usual problem. Engine removal is recommended.
If I can coax the old nuts off the studs, can I get by without replacements? I have coated the nuts and studs with penetrating oil many times, hot & cold.
Anyone have advice on this problem?
I am going deaf driving my trustworthy '72.

VIN: F60CCP10399