Just bought a rusty Jan 69 intake manifold for my car. It was a $120 (shipped) eBay find with all of the fittings still on it. Managed to get all of the fittings off without damage, with the exception of the temp sending unit. Used PB Blaster, heat and cold shock; still nothing. Now I've got it sitting in a pan of evaporust to try dissolving the rust around the threads and get this last fitting to come loose. I've chased all of the other threads, and scraped the gasket surfaces. Under the coating of greasy rust, that intake was pristine; a diamond in the rough. I'm waiting on the various techniques to yield some progress, not get impatient and screw it up.

Figured there were some other gearheads who have been here before and can appreciate the struggle. Don't get angry, don't force it. Let the tool do the work.

John