Yesterday a mecanic I've nearby made a compressión test to my rebuilt 4.0L, as I was complaining about tacking sounds near the 6th cyl and great lack of power.
The numbers are:
#1 = 9,5 #4 = 8,7
#2 = 9,6 #5 = 8,5
#3 = 9,1 #6 = 9,2
I noticed the difference in the 4th and 5th cyls and...