Exhaust manifold stud replacement - stainless or regular?

[Stevehose]

I've had my exhaust manifolds trued and the 6 old crusty downpipe studs removed, I have both ss and regular ones to replace them with, is ss a no-no due to it's hardness vs the other metals, or should I use them given the harsh environment they are subject to? I've got the copper nuts for both the head and downpipe attachments. TIA

 

[deQuincey]

I've had my exhaust manifolds trued and the 6 old crusty downpipe studs removed, I have both ss and regular ones to replace them with, is ss a no-no due to it's hardness vs the other metals, or should I use them given the harsh environment they are subject to? TIA

i would use regular,

 

[mulberryworks]

It's easy to think that stainless steel is the go-to for durability, but it's far enough away from steel and copper on the galvanic scale that you'll likely get increased corrosion.

 

[Stan]

I thought copper on exhaust system bolts.

 

[HB Chris]

The nuts are copper not the studs.