My '91 has a new engine, but they used the old head without a rebuild. I had some lifter noise, which is normal with the 4.0. Recently it became a little noisier, and I drained a pint of oil, replacing it with a pint of Marvel Mystery Oil. Within 30 miles it was much quieter. From what I understand, MMO has solvents that clean out the gunk that cleans out the passageways in the lifters allowing them to maintain pressure. I would bet that almost any lifter solvent/cleaner would do the same thing. I use MMO because it's worked for me before.
ticking noise is usually "lifter noise". if this noise increases in speed when accelerating then it is "lifter noise". just change your oil.and or maitain proper oil level.try using a medium to thick oil 20/30 20/50 , there is a product call lucas which also helps your oil lubricate the engines moving parts easier. i have use it, and it works , it takes a few miles but it works.
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