I purchased a new gasket set that goes between the plenum and the intake. The gasket set has a small black oring, a yellow oring and orange oring. Do any of you know what the black oring is for or where it goes? I did not find a small black oring when I removed the plenum from the motor. I know where the others go.

Thanks.

 

The black on is for the tube? I do remember i had one left over on my build. I just assumed the kit fit more then just my car. I had the GM repair and GM parts manuals and could not find any o-ring other then ones I used.