Exhaust Gasket Question

[shadow9999]

I'm having new exhaust elbows made for both of my engines. They should be ready on about a week or so. Of course, the new elbows will be perfectly machined and will have brand new stainless steel flanges to mate with the exhaust output off of the turbo. When I removed the old elbows, there was some corrosion. I tried as best as I could to remove all of it but because there are studs coming off the turbo that you need to sand around and because of the age of the iron, it is difficult to get back to a perfectly smooth surface. Its not rough and very bumpy, but when you wipe your finger over the metal, you can feel it is not perfectly smooth.

I do have new gaskets which are thin metal covered by a thin black flexible material on both sides. Will the gasket alone be adequate? Should I use something like Permatex High Temperature Gasket material on the turbo side? If I do use some material like this, will it make this job a bear next time trying to remove that Permatex material? Should I just bite the bullet and go back and sand some more to try to attain a perfectly smooth surface? (not sure if I will be able to get it perfectly smooth)

Thanks in advance for any assistance.

 

[JAMZ]

I work on truck Diesel engines, the turbo surface does not need to be perfect on them. Also the gasket is sufficient. May be a little different on boats, but I think you should be fine.