Forward Port on upper intake


Feb 2, 2002
I've been having problems with a vacuum leak and have been unable to find it. I took off the upper plenum and noticed that the aftermarket plenum for the 70mm TB has no provision for the forward port that goes down into the intake to be sealed off. Because of this, the piece of seal around the port broke away and got sucked into the engine at some point.
Is this my vacuum leak?
Does this port need to be sealed off, or is it for stock setup only?
If the surface is smooth and clean the gasket should do fine there. I would not use any RTV if you are considering doing so.