HEAD GASKET SET, FITS 1993-1994 XJ6 FROM ENGINE #179542 ON, AND 1994 XJS 4.0 LITER AJ6 FROM ENGINE #179549 ON. Includes all gaskets necessary to install the head. You need to replace the head bolts EBC1771-SET when you reinstall the head. These are stretch bolts, that must be replaced each time. Comes with qty 12 EBC3531 valve seals. Jaguar issued a tech bulletin that says to use these on the intake AND the exhaust valves even if your engine did not have them installed on the exhaust valves originally. Please order qty 12 additional EBC3531 valve seals if you would like to install on the exhaust valves. (JLM11383)