Where do hot air headers crack?

[mygrain]

I bought an 85 GN motor from a board member and I want to eliminate as many potential problems as possible. Im doing the timing chain, oil pump and rear main so far and I want to check the headers for leaks and weld them before I get them jet hot coated. Thanks

 

[Brent]

right by the collector mainly or at any other weld
Im haveing a hard time remembering what the stock ones look like. mine were cracked though.

 

[FJM568]

Driver's side, between #3 and #5...Passenger side, where the #2 primary meets up with the main header tube...And probably anywhere and everywhere else...But the main ones are listed above...