I broke a bolt off when I removed the exhaust manifold to replace the studs.
The piece that is stuck is about a quarter inch long. I can get a pair of vice grips on it.
I started by spraying it with PB blaster and heated it with a propane torch. It doesn't get hot enough with the Propane torch.
Do I need to use an oxy acetylene torch?
Luckily, I have easy access to the bolt since the fender and inner fender have been removed for other projects.I

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i found map gas to give a hotter flame, works for me so i use it when the old red and green are not available

 

I went to harbor freight and got a small torch set. Then I went to a welding store and got the bottles filled.
I will use it for the broken bolt and to remove the studs from the manifolds for replacement.
At 60 years old it's time I added a new skill instead of asking others to cut or weld for me.
Next spring I will gather some steel and start practicing! I think it will be fun!

 

i did a pair of sb chevy exhausts today for broken studs, good old map gas again

hear you on having a red and green wrench set, that along with a gas mig welder , all tools of the mechanics trade

 

These work great in place of a torch, give a Lot more control of the heat, allowing you to concentrate heat where you want it
And it won’t let you accidentally burn things that don’t need heat

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That looks interesting!
I will check them out. I asked a neighbor to come over and run me through the process of lighting the torch. He not only showed me how to light it, he heated up the broken bolt and I took it out with a pair of vice grips!

 

those coils work great, only issue is they need to have a stud like amount sticking out if not they don't work, sometimes if means very careful drill and tap work, and i do mean very carefully .