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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.

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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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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Well, they did it to me again. I had to order another set of TTI headeres gaskets for my 440. I said, "These are BB gaskets right?" They said, "Yep. Right on the shelf." I said, "So your sure these will fit my Indy EZ heads?" Mancini says,"Yes.". I say o.k., can I get these by Friday? Yes they should be there Friday. I just opened them up, and what did I get? Small block header gaskets. YAYYYYY! Awesome!!!! I get to wait another week for @#$%% header gaskets!! This is freakin' so awesome! Nobody in town carries header gaskets for a Mopar. They don't even list gaskets for as the local auto parts store asks, "Is that Charger a '68 or '69 Chevy?" Awesome! I give the hell up.

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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..

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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..

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I use the Mr.Gasket Ultraseal header gaskets with zero issues, I even re-use them 2 or 3 times.
I tried RTV only once and didn't like it but alot of guys do it that way. I thought it was hard to get the headers on w/o damaging the RTV surface and it was no fun to clean up the next time I removed the headers.

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