If the threads clean up on the old studs they DO NOT have to be removed. The problem usually is that the threads are corroded and when you tighten up you might strip the threads off the studs. If you are going to reuse the studs at least get some new nuts and use Never Seize. "Best Practice" would be to remove the old studs. It isn't that hard if you have access to an acetalyne torch. You heat the studs up to cherry red, let them cool, reheat to straw and then remove. They should come out without breaking but they may remove the threads from the cylinder head. Just put thread inserts in. Be warned, new studs are pricey! David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, DMCVIN6683 <dmcvin6683@xxxx> wrote: > > The studs that are on the heads that hold the exhaust manifold to it > are all on my car except 1 has broken off. > > My question is after i remove and replace the 1 stud cant i just clean > the threads on the old studs and leave them alone and reuse them? > > Do i really need to install new studs? > > Mark V > To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/