Our steam port crossovers are genuine ACDelco - Just like LS3's and other Gen 4's had.
The base kit includes the front crossover with hardware.
You can choose to include the rear block offs if needed, which also include hardware.
Some heads have these ports plugged with a rivet so they may not be needed.
**The steam port outlet should connect somewhere within the sealed cooling system, at the top. It could go to the top of the radiator tank, or the upper hose.
We have a billet inline hose piece with a 1/8npt port in it which is an easy integration of the steam port, if you do not have a spot on your radiator.
Note that this port should NOT go to the overflow tank, or anywhere past the radiator cap.