DON'T USE THESE!

My driver side egr tube on my exhaust header cracked and was leaking. Pulled out the K-member and took out the mac LT to have the egr tube shaved off. I decided to buy these gaskets, big mistake and now I have the a leak. I did not use any rtv. However, the old gaskets looked like they were made out of some steel compared the Ford racing ones below.

http://www.americanmuscle.com/frpp-...ear=2003&T5_Var3=blue&GID=50260&T5_Var4=50260



So back to square one. What header gaskets are you guys using with your LTs and are you guys using any RTV and what quantity of RTV are you guys using?

T.I.A

I have a set of kooks I didn't use only because I had a set of SCE 4146.

https://m.summitracing.com/parts/sce-4146

I have oem Ford gaskets on my car, as we've discovered all others eventually leak. No RTV

Zemedici said:

I have oem Ford gaskets on my car, as we've discovered all others eventually leak. No RTV

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As I do agree, I was very concerned about the copper gasket and different brand failures but was convinced at the pri show so I got them then, before I planed on the rebuild.

I just installed headers on my car. Spent the money and went with new OEM gaskets. Hopefully i have a leak free seal like everyone else.

If you go on lethal you'll see two different Ford racing gaskets. I suspect the steel ones were for supercharged applications. That's what most recommend and what my car had with factory manifolds.


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I have Ford racing gaskets with orange rtv.

Oem steel here. .no rtv

I have reused mine without any issues

OEM steel with no RTV here as well.

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Thanks guys. definitely going with oem

This will probably get some may sayers and ones that feel this will cause harm....... but.... you can use Permatex Hi Temp COPPER silicone in place of the actual header/exhaust gaskets. Put a bead around the ports on the header and bolt up then let it dry over night. There are MANY Mustangs around our area sorting this "gasket" and I haven't heard of one blowing out or leaking in the past 6 or so years. A friend with a Mustang shop uses this method 5.0s, 4.6s and others. IF there is an issue just clean the RTV off and reseal, no buying another set of gaskets

Bdubbs said:

I have Ford racing gaskets with orange rtv.

Click to expand...

same thing i used and so far so good. Its been a few years.

1000 miles on BBK LT from AM, no leaks. About to add 2200 more miles next week on a road trip.

Stock only. Never used RTV, never had a leak.

Guess I wasn't alone. I had the same happen with them and Hooker longtubes, granted it was a fairly small leak I didn't notice until after I pulled the engine.

I've run the Felpros with no trouble ever since, both with longtubes and stainless turbo headers. Only thing that's a pain is them being 2-piece. The same style even sealed perfectly on a warped 2.3 exhaust manifold.