... all I can say is you better have a GOOD, no make that GREAT set of taps. I have the same problem on a set of 283 ram horn headers.
First I got a nice center one of the bolts, drilled it out, put my GOOD "easy out" in it and when I had to crank down on it it popped like popcorn. So, drilled to the biggest I could without destroying the threads. I'm talking 32nd and 64th increments here! Still the old stuff would not turn loose....and yes, soaked them for a week.
So, today I tried the other header and all three of those twisted into as well. Soooo, I blasted them, cleaned them up real nice and tomorrow I'm taking them to a machine shop where they can put the TORCH to them. I figure they'll either come loose or we'll melt them out! I will rethread and use a helicoil if I have to. I'm tired of monkeying with them. These suckers are STUCK and no sense in me making things worse and causing more problems.
