Stian, You need a decant, skilled mechanic, who is used to working on exhaust systems. Any heavy handed work will result in broken studs, that could mean removing the heads or ass one member did, the entire engine. A skilled man, knows how to get the studs out, by heating up etc. There are some spare tapped holes that can be used if necessary. Some people increase the size from the very thin 7mm it 8 or more, but head removal is normally required. Cast iron does goes rusty, if the gaskets are not blowing , I wouldn't worry about it personally. Hope this id helpful Chris P BTW (Stain..you have not renewed). -----Original Message----- From: Stian Birkeland [mailto:delorean@xxxx] Sent: 11 May 2002 09:35 To: dmcnews@xxxxxxxxxxxxxxx; DOC UK; delorean-nl@xxxxxxxxxxxxxxx Subject: [doc] Exhaust manifolds removal? I have discovered that the exhaust manifolds, LH and RH side, are very rusty. Now, that happens to every automobile that I know of. But - what worries me is when the time comes and I have to change the gaskets. It looks like the original fasteners of the manifolds (studs?) have rusted to an extent that they will be impossible to remove without screwing up the aluminum block! So, what is the fi...snip.....