Detroit 12.7 Exhaust manifold removal??

This has about 900k miles on since overhaul so Im guessing its been on since then.

Do these manifold bolts tend to break? Usually I heat manifold bolts with torch and never break them.. but i have not done this type before... has long spacer and long bolt, making the ability to heat it with a torch and actually affect the threads way harder.
Would it be easier to use a cut off wheel and cut all the heads off, remove manifold, then i can easily get to the base of the bold and heat it and remove them with a pipe wrench?
I just want to avoid them breaking off flush or having to use a drill.

 

Thanks all.. sounds relieving..

 

Wow, I was expecting a fight, easiest thing ever to come off. Manifold looks perfect, it rings so no cracks.. however the slip joints leak like mad. Do they make a seal for them? Be nice to machine grooves in and put a couple gapless piston rings in it..

 

$500 for a manifold, something with no moving parts is crazy... I cant even fathom the price of the full tilts. And besides not leaking there is no other benefit to it. They say there is, but its a pipe directing exhaust to the turbo which is the choke point, the turbo is, not the manifold., so not sure what they are smoking. Of course everyone that puts one on sees an improvement... because their old one was leaking lol..

I found some 2.5" bore cast iron piston rings on ebay , 4 for $16. The ends overlap so its a total seal type ring. I will cut some grooves in each pipe, put 2 rings on each joint. use ring compressor to install pipes together. I dont know why they were not like this to begin with. It will be impossible to blow out or leak.