Can anyone give me advise on how to fix a "bent" exhaust manifold that will not fit correctly? Is there a standard way to make this thing fit? Thank you.
buy a new one
You are welcome to use my exhaust manifold fixture to heat and straighten your exhaust manifold.
Beware of my mistake. Fortunately it was a 26-27, not one of the rare ones.
If you have lots of acetylene and oxygen and time you can try straightening the manifold hot. Beware it'll break easily during the process, let the weight of a wrench screw it in alignment when it's hot enough, any extra pressure can break it.
Here is a thread with lots of links to pictures & discussions on the subject: http://www.mtfca.com/discus/messages/331880/344903.html?1362171562
Roger: You should add one word to your post "FREE". Put it in front of acetylene.
Buy a new manifold. It is cheaper. Dan
How do you straighten it when it's warped on the other axis? I had one that wouldn't seal because the two center ports were bowed out towards the passenger side further than the end ports.
Seth, that's easier than the usual drop in the back. You put the manifold on the car and run it with a lean fuel mixture and retarded spark until it becomes red hot, then tighten the studs as tight as you can without breaking them off and let it cool down. Next thing to do is replace the exhaust valves! Easier and cheaper to replace the manifold.
Lol, I actually had another exhaust manifold in my small pile of parts. I'm pretty sure my granddad knew that the manifold on the car was warped but hadn't gotten around to installing the 'new' straight one.
I helped make and give demo at Long Beach club meeting on how to straighten the manifolds.
It's very easy and works like magic. Check out the two videos by Tulsa and LBMTC.