ehxuast stud removal

[02GF74]

what is the likelihood of me being able to remove the exhaust nuts without snapping the studs and more importantly, remove the exhasut studs without them shearing off? (both look failry rusty).

I could split the nut but not sure about the studs.

do they usually seize in the head?

[RALPHARAMA]

what is the likelihood of me being able to remove the exhaust nuts without snapping the studs and more importantly, remove the exhasut studs without them shearing off? (both look failry rusty).

I could split the nut but not sure about the studs.

do they usually seize in the head?

Yes
If you have the opportunity to taken 'em out with the engine hot I would, as the aluminium of the head expands faster than the steel stud so it's more likely to let go when hot. I broke one on my engine and had to drill the bastard out and re cut the thread. In preparation, squirt wd40 or any other penetrating oil couple of times a day for as long as possible before trying. The nut is likely to come off the stud as it is only rusted where as you get bi-metal corrosion where the steel stud is in the ally. I made new stainless ones for mine. I bought some bolts from Screwfix, cut off the heads and then cut another thread on the opposite end leaving the correct amount of plain section. You'll need a good quality HSS die to cut stainless as it'll fuck up el-cheapo carbon steel ones in no time. Machine mart sell some useful stud extractors that attach to a ratchet wrench. Be careful with 'em as it's very easy to put too much torque on the stud with them. If you do snap of a stud I would recommend not using an eazi-out style stud extractor as they invariably snap off and then you really are in the shit, having a high carbon steel thing stuck in there. The only way out then is to take the head to an engineering shop and get it removed with spark erosion.

If you're any where near Pensford I'd be very happy to give you some help. If not there's bound to be a Zed Head in your area with some engineering knowledge.

Good luck with it