My difficult head studs were extracted eventually to repair these expensive Porsche heads without paying an arm and a leg. In my case the steel studs were so corroded, I had no choice but to drill a few of the broken studs out. I tried everything included heat, welded on washers and nuts, spiral extractors, straight extractors, left handed drill bit, penetrating oil, bees wax, dental pics, thread chasers, etc. This is a tought job especially since the usual stud remover tools won't fit due to the air cooled fins on the Porsche heads. UGH, but I got all twelve out without a single helicoil.
You can see Part 1-4 below:
Remove engine from car -    • How To Remove And Diagnose Engine Pro...  
Diagnose Engine Misfire -    • Suspenseful Porsche 911 Carrera Engin...  
Clean Up Engine Bay -    • You Might As Well Clean That Engine B...  
Inspect Rebuilt Heads -    • Unlocking Peak Performance:  Porsche ...  
Tools in this video that you need -
IR Gun - https://amzn.to/3Sh1W8N
Bolt Extractor Straight - https://amzn.to/3O2pUlL

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00:00 Introduction to removing broken exhaust studs
00:56 Collet style stud remover is too large
02:41 Using Kroil Penetrating oil to break up corrosion
03:44 Weld a washer and nut to broken stud
04:06 Drill Broken stud
04:55 Trying straight style extractor
06:29 Picking out threads one by one
07:22 Using Tap to pull old threads out of hole
11:19 Inspecting Cylinder and Pistons
13:25 Measuring piston groove to ring clearance

#brokenbolt #brokenstud