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I use the hi temp silicone on both sides of the fel-pro gaskets and they seal perfectly and become reusable as only the silicone sticks, not the gasket. I never tried silicone only, but like someone above said, if your flanges are true, it oughta work!

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I always used gaskets when the flanges have the welded bead on the head surface. You just dont have as much surface area for the silicone to seal up when its like that.

Nope. Russell at Mancini said his shipping dept. messed up.....

If the flange is flat with no welded bead on it I just used silicone like the others say.

Also, I would think the wrong gaskets in the box would be a TTI issue and not Mancini.....

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Just put the Black RTV on the head side and carefully install your Headers ... use 12 point header bolts and call it a Day..... As for the gaskets leave them for the street cars.. They will change them twice a year and keep the gasket companys going..

I have never used gaskets on my headers ever..