Original Exhaust manifold bolts?

[hotrodtim68]

Looking for the smartest way to remove 46 year old virgin exhaust manifold bolts hopefully without snapping any; on a running 289 in the truck. Any good experienced mechanical advise would be helpful .

 

[Chief Master Sergeant]

Start soaking them in PB blaster. Soak them and let the motor run if you can. Repeat for a few days. The heat and the PB Blaster will work together to free up any rust. The more time you take to soak everything the better. Good luck

 

[BR549]

Just did mine and had they same concerns Sprayed with wd-40 several times over a few weeks. I put a closed end wrench on them and tapped with a hammer to jar them, and to my surprise they ALL came out easy. The replacements from jbg are nice, but 4 of the long bolts bottomed before tightening. Good thing I have a huge selection of bolts.
Once a had a ford 390 with cracked exhaust manifolds and I was told by a ford expert not to touch them as he was sure they would break. That must not apply to the sbf. Good luck