Pulling the cyl studs to clean them up and scrape the gasket last night, i used a nifty stud puller i bought on ebay 6 or so mos ago the neat thing about it is its basically a reverse drill chuck with grippy jaws, but will allow the threaded part to pass thru the tool so you only grip on the smooth part of the stud not messing up the threads. got all 8 pulled in less than 10 mins w this thing. opened up, put over, used air ratchet and they all jus tpsun right out. would be great for case studs as well, would probably chew up an exhaust studs threads. however, would recommend one for the tool box.
https://www.ebay.com/itm/144224024402?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=EMPDi9DKSva&sssrc=2047675&ssuid=9DXeqLNdSLW&widget_ver=artemis&media=COPY
Cool!
I have one of these: https://www.amazon.com/Powerbuilt-648639-Stud-Extractor/dp/B002INQORU
Pretty sure I paid like $10 for it, but that was at least 20 years ago. I still use double nut's with two wrenches pulled against each other fairly often.
i have one of those as well. this seems to def be more 'agile' for this type of stud.