The tube I seen said high temp copper selant, 750 deg? is that high enough for the header gaskets?

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I always use the permatex ultracopper. I have never had a problem with blowing a gasket. I have even had loose header bolts and not blown the gasket. I don't think that your going to have any issues, just be carful and get a good coat on the gaskets (both sides) and you should be fine.

 

Does anyone know the temp of the permtex stuff? thanks

 

It was not permatex though.