the ones I ordered look more like this:



will that work?

You need to read a bit more, as galvanic corrosion depends on relative size of anode/cathode too, so say a small SS bolt in a large block of ally is much less of a problem with GC.  A smear of proper lube on the threads will reduce the risk to negligible.  Same same with SS bolts n nuts automatically galling and seizing if put together, it's rubbish, you just have to take the proper precautions like not going too fast, using lube, not over tightening etc.

In metallurgy and materials science there are very few situational absolutes and everything is dependent upon exact conditions.  So when you see sweeping statements on the internet about stuff like this it's mostly cos the person has no idea what they are on about.

What part do you mean, there are no M8 washers between block and headers.

What better way to spend one of the hottest days of the year? Removing cracked headers!





The last one took a 12mm socket hammered on to get out - which brought the stud with it. Two of the studs need replacing so I ordered some stainless studs and nuts thinking that would stop the corrosion. Then I read about galvanic corrosion between stainless steel and aluminium alloys. And how if the stainless stud snaps in future (more brittle also apparently) then it's a world of hurt removing them as they're significantly harder than mild steel to drill out.

So - will copper slip on the stud prevent galvanic corrosion? Should I just send the stainless studs back and order regular steel studs?

Thank you Kiwi60, very helpful. Thats what i like about this group, people like you !