When I was working on my timing after the Pertronix install (Thanks Jac04) I noticed the distinctive sound of an exhaust leak. Get a moment to look back there and see a nice crack in the #4 exhaust pipe. What is the consensus on using JB Weld on this? I REALLY dont want to go through the manifold removal process (Ive heard the stories of broken studs!). I'd like to use JB Weld on it and leave it for a little while. Is this advisable or no? Thanks!

J