Yes.
Approximately 302 Cubic Inches.
oN THE 91 FORD CROWN VICTORIA YOU WILL LOCATE THE SPEED SENSOR ON THE DRIVERS SIDE OF THE TRANSMISSION ON THE TAIL SHAFT.
87 octane ( unless its the supercharged 5.4 L then 91 octane )
According to one of Ford's websites : For a 1991 LTD Crown Victoria , 5.0 liter / 302 cubic inch V8 : ( .050 inch spark plug gap )
Yes, but is there air suspension involved? If so, there are replacement springs for the air bags.
.050
According to the 2003 - Ford F-150 - SVT supplement : " premium " unleaded 91 octane or higher for best performance for your super charged engine
Try running it on 87 octane. If you detect pinging move up to 89 octane. If it still pings you will have to go to 91 octane.
It uses regular unleaded 87 octane, unless it's supercharged, then it uses 91 octane minimum.
You should be fine with 91 octane. The higher the octane, the more you engine will like it, but 91 octane is enough for your ES 350.
Its built into the alternator on all vics from 91 to current