Exhaust manifold studs pros and con questions....

[blue62]

Originally Posted by ike84

As blue said, go with copper nuts (not stainless). The reason for this is that same composition metals will undergo "cold welding" under high temperature and pressure, whereas dissimilar metals (i.e. steel and copper) will not.

It's a neat process. It happens in a total vacuum. Touch two steel rods together and they become one. Here, the heat and pressure just serve to drive it all the oxygen molecules out from between the iron molecules.

Knowledge is power!

Btw, the downside of using threaded rod instead of actual studs is that the studs have a hex head cut into the end, whereas the rods will require double nuts to torque and loosen.

I used m8 x 50 mm studs for a Ford V8, cost $15 for the dry on Amazon.

Sent from my POCOPHONE F1 using Tapatalk

Ike,
Exactly, I don't like stainless or higher grade metal in any exhaust fastener.
If for some reason you have to drill, cut, whatever to remove it, softer is better.
Copper or brass nuts will not freeze on rusted steel. No galvanic corrosion with the brass or copper.
A clamp or band or pipe that is stainless is great just not the fasteners.

[BYprodriver]

Originally Posted by blue62

Ike,
Exactly, I don't like stainless or higher grade metal in any exhaust fastener.
If for some reason you have to drill, cut, whatever to remove it, softer is better.
Copper or brass nuts will not freeze on rusted steel. No galvanic corrosion with the brass or copper.
A clamp or band or pipe that is stainless is great just not the fasteners.

There are several different grades of Stainless steel.