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1982 911 SC Head stud inserts

Engine

Vehicle Information: Model: 911 SC; Year: 1982; Body Type: Coupe; Total Mileage: 91500;

I recently took my car into the shop to check for the cause of a raspy rattle sound when the car was warm and under heavy load at acceleration. I've owned the vehicle for 10 months/5000 miles and I just started noticing the sound about 3000 miles ago and asked the mechanic to check it out when I took it in for a recent tune-up. In the process, the mechanic found a broken head stud in cylinder #3. The 3 options the shop offered was to 1) replace the single stud, 2) replace all studs on the left side, 3) replace all studs both sides. I don't want a band-aid so am leaning for option #3 (the mechanic agrees due to the assumption that if one is broken, then others are stressed as well). The mechanic says that this procedure would include putting in what he calls case savers, i.e. threaded inserts. So for each removed stud, if there are not inserts already in the block, he would drill, tap, and insert threaded inserts for each stud. He says that this is a safeguard he usually uses to keep the studs from pulling out of the block later on. One question is, is this a normal recommended procedure? I am not feeling that comfortable with someone drilling and tapping the block if the procedure is not called for. Furthermore, if the studs are just replaced with new studs (i.e. without inserts) is the integrity of the block's ability to hold the stud compromised by not installing the inserts? Given that the engine has been performing excellently prior to taking it in, there are no noticeable oil leaks (no oil on the floor of the garage), the sound is noticable only under load, is this something that can usually be fixed by just replacing all of the studs and gaskets? Note: I have little maintenance history prior to my purchase but I do have a repair bill showing an R&R engine which included new exhaust guides, cam and lifters,complete valve job and cyl. heads resurfaced 31K miles ago (i.e. at 60K miles).

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