Ford 2003 Mustang Workshop Manual page 1570

56. NOTE: If the valve cover is not secured within four minutes, the sealant must be removed and
the sealing area cleaned with metal surface cleaner. Allow to dry until there is no sign of
wetness, or four minutes, whichever is longer. Failure to follow this procedure can result in
future oil leakage.
Apply silicone gasket and sealant in the locations shown.
57. NOTE: RH is shown, LH is similar. Inspect and install new O-ring seals if necessary.
Install the valve covers and tighten the bolts in the sequence shown.