Plus probably come preset
The correct spark plug for both the normally aspirated AJ33 and AJ34 and supercharged AJ33S and AJ34S 4.2L engines is Jaguar part number AJ8 4575, which is made by NGK and is their part number IFR5N10 (7866). This is an iridium electrode plug and the gap specified by Jaguar is 0.9mm-1.0mm (0.035-0.039 in.).
SOURCE: Is it difficult to replace spark plugs in a Jaguar XJ8
Your car does not have plug leads so that will save you a job,the spark plugs are fairly easy to do tho.
Open the bonnet,either side of the engine at the top there are 2 black covers bolted to the top of your engine,bolted to those are 2 smaller covers,remove the 2 smaller covers which will reveal your ignition coils,remove the ciols and your spark plugs are there.
You will have to remove the air filter assembly tho on the right hand side which is easy enough,remove the bolts from pipe at the rear middle of engine,undo the clips which houses the filter and disconnect the engine breather pipe.Re assemble in reverse order,
N.B the spark plugs dont want tightening too tight..or too loose,when the plug nips up just give it a little nip again..GOOD LUCK
SOURCE: Spark Plug gap settings.
Look on you're emissions tag under the hood they should be on there.
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