how to fix an exhaust leak on a header?

[wshI_hd_1]

OK, heres the promblem. My dads car has a really bad exhaust leak coming from the header...and he tried putting a new gasket on it and it didnt work. Its blowing air between the block and header, and im not really sure what to do...anyone have any ideas...thanks

 

[91LX_5L]

header might of warped, remove it and see, put a level on it or a square edge.

get felpro gaskets not cheap **** ass paper ones, try putting a bead of high temp silicone on as well.