Stripped thread on exhaust stub

[Mr. Ron]

Hi John.
...i think some of us might call it a gaggle of airheads, but i'm really not sure.
I thought about it after i posted my last reply"...hmmm, that sounds confusing..."
Your right. The exhaust thread is not an insert like i said, but part of the casting. The machinist cut off the thread, bored out the port to accept an insert which he skilfully turned on a lathe. I'm not sure how he pressed the sleave into the undersized hole, but i guess he froze the insert and heated the head in an oven and slipped them together. The end result is a nearly flawless fix. You can only tell by looking very carefully whats been done.
BTW...next time you come to BC, i believe there is a train you can ride north through the Fraser Canyon. Haven't done it myself, but i here it's a brilliant ride!!
Take care.