Nitrous Express Ford 4.6L 2 Valve Plate System - Manual (Page 2)

Next, using the supplied gasket, reinstall the upper
intake elbow on the nitrous plate. Once again double
check your nitrous and fuel configuration, making
sure the plate has the word “TOP” up and “Fuel” is
facing the front of the vehicle.
Now install the 4 main intake bolts to secure the
upper manifold and nitrous plate to the lower plastic
intake manifold. Do not tighten.
Once the four plate bolts are loosely installed, you
may install the provided spacer beneath the support
leg of the upper intake manifold and install the final
bolt, again do not tighten.