Re: {Chrysler 300} 300K exhaust manifold gaskets

[John Grady <jkg@xxxxxxxxxxxxxxxxx>]

copper gaskets are the best if you want to pay for them  . , I think . cannot blow out and have an embossed ridge around port .

i would be wary of any chemical unless you really know the temp of manifold and it is below rated sealer max . 

if no gaskets you should mill surface perfectly flat , but actually much more to it than that — as manifold expands axially end to end and it WILL do that , ( as well as outward on bolts) then when it cools it can crack . Gaskets let it slide slightly “find itself” , copper or SS sandwich type with carbon / graphite in middle  are good for that  . 

See  also special cup washers on slant six ( long manifold) and older cars , oversize bolt holes . Way to go !!  Set up to slide a bit . The gaskets  in engine kits at pipe flange often are some kind of high temp paper like stuff with metal middle .

I don’t like those .. paper stuff blows out .

Pipe flange often not flat from welding , that cracks ears too 

ram exhaust manifold are big bucks now   , compared to copper gaskets 

While on this , never hang head pipe or exhaust system off manifold flange while installing . It snaps that ear off so easy you would not believe it . like it is glass is how to think about it . Have seen that 6-7 times. 
I agree with one size smaller stainless on that flange too  .

Not fanatic about it, just opinion 

Sent from my iPhone not by choice 

On 29 Oct 2021, at 6:27 pm, dverity via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

When the block and heads were made and had a nice  smooth surface, gaskets were not required. The problem with gaskets is that most need to be re-torqued a few times as they shrink from the heat. I used to use them all the time, but even with re-torqueing, they still burned out. If the manifolds are flat and pit free, you can use a light coat of high temp silicone sealer, which is what I use now. My Imperial with 440 has been set up like that for 2 years now, and not a leak anywhere.

Don

Dumb question but why wouldn’t we use gaskets?  For any exhaust interface?  As long as they are good quality, and won’t be prone to leaking.  I like the kind with graphite crush.  I’ve also seen where some folks use hi-temp permatex to coat the gaskets.  

I use 7/16-14 stainless bolts and locknuts for the manifold-to-pipe connections.   Not saying they’re better, but hopefully easier to remove them in the future than the (usually) horribly rusted carbon steel bolts and nuts you often run into.  

Respectfully 

dave

Sent from my iPhone

On Oct 29, 2021, at 4:09 PM, Frank Newhouse <newhousef@xxxxxxxxx> wrote:



On the same subject but a different car. 1961 300G Cross Ram with two fours.

 Exhaust manifold gaskets or no gaskets

Thanks

Frank Newhouse

1961 Chrysler 300G

On Fri, Oct 29, 2021, 3:04 PM <apozdol@xxxxxxxxxxx> wrote:

So I had some cracking noises develop at start up when cold and sure enough, I found the manifold nuts barley tight both sides, and no gaskets. Somebody was playing here. Manual says 30 ft/lbs torque for the nuts.

 

I searched the parts book and it is a little vague to me. Do the single carb 360HP engines use exhaust manifold gaskets, or not? The parts book calls for them for the ram and hemi engines.

 

Allan

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