Ive heard to make a removable baffle inside a dohc b-series valve cover you can
drill out the rivets and tap them. anyone had any experience/pix? drilling isnt hard im wondering more of what side drill bit, what size tap, and what length of screws/allens were used....thx for any input!!

 

The point of this is why?

 

im gonna tap the v/c on the front for catch can bungs and it was also powder coated and i want to remove the gunk from the baffle.