The burner peep hole is the small door above the mixing tubes. It allows you to view the main and pilot burners as well as allowing you access to light the pilot when starting the car.
It is imperative that peep hole seals when it is shut so that fire doesn't escape and light off the branch forks thus causing a tube fire which can crack the burner grate. I decided to construct the peep hole out of a piece of pipe. Cutting a slot half way thru to allow the door to slide open and shut while retaining excellent support. The tube was welded into the burner pan creating a passage through the insulation to the inner liner.
