Hey all, is there any difference between the '91 4.0 HO and a standard 4.0, and if so, what are they?

 

4.0L I-6 MPI - 173 hp @ 4,750 rpm, 220 ft lbs @ 3,900 rpm- used '87-'90.

4.0L I-6 HO MPI (High Output) - 190 hp @ 4,750 rpm, 220 ft lbs @ 3,900 rpm - used in '91-'95 and updated in '96-'01 to 225 ft lbs @ 3,000 rpm ('00-'01 models use a distributorless ignition system).

-Kyle

 

Thanks for the info. Now I know I have to look for a '91+ motor.