Jeep Cherokee 1999 parts wanted

4.0 high output, not 3.9 why do you specifically want those MY motors if you don’t mind me asking? The later engines weren’t as well built as the early examples. Heads being the weak point

I had wondered if it was to go back into a Cherokee or wrangler. The later engines have some design changes to the heads meaning they only fit those model years if that makes sense so make sure you are tracking down the right model year motor if it is to go back in a Jeep.