TriumPhil said:
Personally, I believe that JB weld will hold up to the heat. Years ago, on my old pool heater (long ago replaced) I used JBW on a cracked manifold and it worked like a charm until the rest of the unit kinda' decayed. Call their toll free # and speak with their tech support, Will. If it can withstand the heat, it certainly would be the cheapest and easiest fix!
P.S. I went to their site online and it indicates that it is good in apps up to 500 degees F.
Phil,
On the single open header exhaust I made, which was too loud,
I bought a baffle that slipped in and was attached,
with a screw through the outside into the baffle.
Screw came loose, lost the baffle.
Ordered another one and replaced it.
This time I mixed up JB weld and put it on the interior threads,
figuring it'd work since I've had good luck before with it on a cracked chevy block.
Melted or burned off and lost another baffle.
Don't know what the heat is inside the exhaust is,
but it must be alot more than 500 degrees.
Gave up and went back to stock with a bypass.