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They are probably not bolts but studs. Each has one split washer and a nut. Take the nut off on of the studs and screw in onto the one your wish to remove. Using two spanners lock the two nuts against each other (Now you have two nuts on one stud). Then unscrew the stud using the inner nut. This should unwind the whole stud. Use two spanners to separate the nuts and repeat for all 8(?).

Apparently Holden Rodeos have a problem with broken exhaust studs (along with cracking the exhaust pipe at the collector point (where the exhaust becomes one pipe). I have a 1992 Rodeo 4WD. The last bolt into the exhaust manifold was missing (when bought). Someone had tried to drill it and made a mess of it. Your choices are: drill the snapped bolt out yourself (potentially a big problem - you might drill through to the water jacket), get the exhaust shop to do it - they might drill it out, put a heli coil in (to accept a larger bolt) or get them (or someone else) to TIG weld it and fill it with aluminum and then redrill it to original. I decided to ignore it and get the exhaust shop to put plenty of sealant either side of the exhaust gasket. It has not made a sound in 2-3mths... (don't want to curse myself).

Sometimes you got to ask yourself is it worth it - I like to get any car I've bought back into as good condition as is reasonable - but some jobs take a lot of time and or money for little real return.

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Q: How do you replace the bolts in the exhaust manifold?
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