Who makes/sells a good quality header gasket for TTI headers 440 base engine part# please, RPM heads and 3 1/2 collector gasket.

I use the Trickflow header gasket ,MLS style steel/aluminium ?
I use ebay copper coleector gaskets

Tex

Mr. Gasket ultra work really well for me

I don’t know the part number but I bought copper collector Gaskets from Summit years ago and they are still going strong on my Duster.

I like reflex, best header gasket I ever used. As mentioned copper is good for collectors.

I second RicRaw on the Remflex gaskets. I have them on my wedge running hookers and Eddy Performer RPM heads. No leaks and lots of crush. Supposed to be reusable but I haven't tried that yet. They are pretty thick (~0.250") so if your fit is really tight, they might make things worse.

Regardless what brand, consider this:

Fiber only = very conformable but short life
Fiber-faced over perforated metal = conformable with long life
metal faced (flat of MLS): not very conformable for sealing; will last very long

I'm a former gasket engineer from a major company.

I buy the TTI Gaskets, they are the best exhaust gaskets I have ever dealt with.

Only times I've had exhaust gasket problems, the actual cause was trying to seal mis-matched or warped surfaces.

I agree with this. The other problem I've run into is bolts loosening. Locking header bolts are wonderful. That or safety wire. Also I've used wire connector star washers under the bolt head and nut.

Don’t you just love these guys that start a post and disappear.

I’ve used dead soft pure copper gaskets on headers and iron manifolds

Any gasket with a thin skim of copper rtv works great. Copper rtv and copper gaskets is bulletprofof and reusable. Just wire brush it off and re-apply the rtv each time you need to take it apart. My brother got this idea from some fuel altered guys who came here years ago as that is what they did with their race car.

I didn't disappear, I had a very busy day. I picked a set of Fel-pro 1414 locally. and Mr gasket 3 1/2 collector gasket. I will put some high heat silicone on them. I will order the remflex gasket. Thanks guys, sorry for getting back late.

There is no need for any silicone to be placed onto the fiber-faced gaskets... in fact, the Fel-pro gaskets have Teflon anti-stick coating applied so that they will not stick... and favors re-usage. The fiber facing will conform as long as there isn't a lot of warpage (as any gasket always wants flat straight surfaces to seal properly).