MrMarty51
Well-Known Member
That method works well for broken exhaust manifold studs/bolts too. The secret is to have a hole all the way through, then, get the stud/bolt to puddle before hitting the oxygen. The cast iron will remain, even the threads, then a thread chaser to clean up the threads.When I did my 93 (upper and lower 16 rivets total) I chose to very carefully with a cutting torch, snip the rivet heads off, let cool, hit em a cut off wheel just enough to remove the slag and scale, drill a 1/8" hole all the way out the bottom to let the flame through, fire up the torch again and very carefully blow out just the rivet at least half of it then drift and hammer em out while still hot.
Takes some feel to get the torch to peel away the metal but it works well. Use at least a shade 5 safety goggle/glasses for obvious reasons and it helps to see what you're doing with the flame.
This method will not work if there is any obstruction in the bottom of the hole.