Can JB Weld Extreme Heat save my exhaust manifold?

[oil pan 4]

I don't put stainless on the exhaust system.
The stainless nuts and bolts always seize together.
Germans use stainless bolts and studs and brass nuts, that seems to work. 304 Stainless has bad cohesion problems.

You may be able to get a header.
Might not have a converter but who cares.

My friend put a header on his Toyota Tacoma. He found places that sold them for $200 to $300 but we're always sold out, a new dealer manifold was $430.
He got a new header for $120.

[Shaneajanderson]

Originally Posted by oil pan 4

I don't put stainless on the exhaust system.
The stainless nuts and bolts always seize together.
Germans use stainless bolts and studs and brass nuts, that seems to work. 304 Stainless has bad cohesion problems.

You may be able to get a header.
Might not have a converter but who cares.

My friend put a header on his Toyota Tacoma. He found places that sold them for $200 to $300 but we're always sold out, a new dealer manifold was $430.
He got a new header for $120.

Use the copper high temp anti-seize to help mitigate that, double nut it if you're worried about it being too lubricidous and walking the nuts off over time. Or as you said brass, bronze, or even plain steel nuts will not gall to stainless, and sometimes even different types of stainless will work (ie. 316 [standard hardware stainless] bolts with inconel nuts.)

[oil pan 4]

Double Nutting with free spin nuts almost never works.
I normally use steel nuts as brass isn't always available.
The advantage of 304 on 304 is it almost never backs off lol.
316 are harder to find and are more expensive.

[Shaneajanderson]

Originally Posted by oil pan 4

Double Nutting with free spin nuts almost never works.
I normally use steel nuts as brass isn't always available.
The advantage of 304 on 304 is it almost never backs off lol.
316 are harder to find and are more expensive.

I have never come across 304 hardware, it's machinability isn't very good, and pretty much only is in use because it's relatively friendly to forming, cheap, and can be welded.

The vast majority of stainless hardware is 316.

[dwtaylorpdx]

Order the cast iron nickle rod from Lincoln. Youll need a stick welder and the knowhow to weld.

Prep the crack, it needs ground to a V about 1/2 the thickness of the metal.

Heat up manifold in a oven for a couple hours,, pre clean well your baking the contamination off. Having it chemically dipped first helps.

Put a torch inside the manifold to keep the heat up

Weld with the stick rod.

Have a box ready with about 3" of sand in the bottom
after you finish the weld, put the manifold in the box on the sand and cover with sand.
Let cool down for 8 hours or better yet just leave it over night..

I've done a couple tractor exhaust manifold like this and they lasted years.

Cleanliness is critical..