Sealing extractor gaskets?

[4runner]

What's the best sealant to use on extractor gaskets? I am having trouble with a BB Chev, that after several heating/cooling cycles, the extractors start leaking at the heads.:confused:

[howy]

Use silastic. It works wonders!

[Cruisin']

Yeah silastic is cool get some of that, get the right colour though, if I remember correctly different colours have different uses. Think black is the one your looking for, read the label on it and ask the person in the shop.

[steve20v]

Yep, different colours are for different uses / heat ranges. The orange one works well for me on the exhaust manifold, i use just the silicone without a gasket and it doesn't leak.

If it still continues to blow-out regularly, you may need to have the flange on the extractors machined, or possibly the head.

[4runner]

Have bought some Loctite "Copper Maxx Silicone". It is recommended for exhaust manifolds. Thanks for the replys.

[Bitza]

What type extractor gaskets you using??
If they're the paper type gaskets, thats your problem.
Use the thicker metal type manifold gaskets, never had any probs with them.