I'm going back together with my '93 LT1 and cant figure out where one of the emissions lines goes. There is a small 1/8" or 3/16" nipple coming off of the tube that passes between both exhaust manifolds and that bolts into the back of the intake. The little sticker under the hood of the car covers all vacum/emissions lines except this one. Can anyone tell me where it goes? On my car it is a white plastic nipple that points straight down and is located only a couple inches to the right of the EGR valve that is pointing upwards.

 

Nevermind, I found the answer I was looking for. Here it is for those who are interested:

http://shbox.com/1/air_check_valve.jpg