How do you seal your exhaust manifolds/headers ?

[Glenwood]

I used the felpro kit gaskets with the manifolds without leaks on iron heads. The new Dougs headers came with gaskets that sealed fine on the new alum heads (so far so good!)

 

[beanhead]

Aluminum heads/TTI headers... Remflex there and also at the collectors. Can't stress enough how great they work. Also can't stress enough how fragile they are and they can crack if you drop them or fondle them too roughly..then they blow out as soon as you start your engine.

 

[Fran Blacker]

Used dead soft aluminum, collector leaked.

 

[polywideblock]

remflex on all of mine

 

[YY1]

I'm fairly certain the factory didn't use gaskets.
I didn't put anything on my 318/manifolds when I put it back together and it's fine.

For old school headers I used to cut the flange between each end pipe and the center set.
This allows a MUCH better seal on any gasket you use.

 

[moparsquid]

if header gaskets are paper soak in water and re-tork after it warms up

 

[Joske2]

Standard Fell Pro with manifolds, no leaks, with headers, only Remflex.
They are the best but fragile.

 

[6pktgo]

Factory HP manifolds, no gaskets ,just a thin layer of "The Right Stuff" 9 years ago & no leaks.

 

[QuickBpBp]

https://sdparts.com/i-24102492-mr-g...&utm_term=4582695747862282&utm_content=Brands

I always had good luck with these cheap Mr. Gasket ones and Hooker Super Comp headers. Soak them in water for a few hours install, run and get some heat in them and retighten. NEVER leaked...