Header Bolt Sealant/Coolant loss

[srousseau]

I have a 69 Dart 340 and added tti headers and new header bolts. It seems like I have a coolant leak from the drivers side rear header bolt that goes into the coolant jacket. I am losing coolant out the exhaust to the tune of about a gallon every 10 miles. There is no coolant in the oil and none leaking out the bottom. I was going to pull the header bolt and use a sealant to stop it up.
I am sure I am not the first to have this issue. What do you guys do to deal with this?
1. If you use a sealant, what kind do you use?
2. I have had a hard time finding a sealant that will handle extreme temperatures. I have found a couple sealant that go up to 400 or 500 degrees, but I am sure the temperature at the header is a lot higher than that.
3. What is the recommended torque for the header bolts?
What say you experts?
thanks!
Scott

 

[69FBCuda]

There was a discussion on here about a week ago for the same topic do a search and you will find all kinds of answers

Exhaust Stud Leak at #8

I have a 1989 LA318 roller installed in my 65 Dart GT and can't get the exhaust stud at #8 cylinder yo quit leaking anti freeze. I have pulled the stud out twice now and applied Permatex high temp thread sealer and it still leaks. Also put in a leak stopper in the system. Any suggestions/fixes...

www.forabodiesonly.com

 

[Divenut]

I have used red hi-temp rtv with good success.

 

[tedsweet]

cant believe would go into the exhaust

 

[Demonracer]

I've used red Hi-Temp silicone for ages on my race cars and street cars with no leakage.

 

[RustyRatRod]

The solution is to use the correct studs in the four corners of the heads. They have a bevel on them that matches a bevel in the bolt holes in the heads and that's where the sealing takes place. That's why bolts will fail to seal there. I normally put some high temp red RTV on the threads anyway as an extra precaution.