I believe that is the 302 cubic inch ( 5 liter )
The 1998 Mercury Grand marquis has the 4.6 liter / 281 cubic inch Single Over Head Cam ( SOHC ) engine from the factory
A 1998 Mercury Grand Marquis came from the factory with the 4.6 liter ( 281 cubic inch ) Single Over Head Cam , V8 engine
What size motor? What accessories do you have? BClear.
6x8
15 inch
Which ones?
According to the 1998 Mercury Grand Marquis Owner Guide : ( 71.9 litres / 19.0 U.S. gallons )
prob a 16 but that would be pushing it 22s will fit without changing anything
For a 1992 Mercury Grand Marquis : From the factory it came with the ( 4.6 liter / 281 cubic inch ) Single Over Head Cam ( SOHC ) V8 engine that was made in Romeo Michigan ( the 8th " character " of the VIN is a " W " )
4x6
20 gallons
4.6l sohc v8