I decied to swap a head from my 87 cherokee to a High Output head from a 93, got the head off only to find this
Heres what was on the valves of the old head before it came off
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This I belive was due to either penziol or some sort of detergant the previous owner may have put in. It scared the [censored] out of me to think what the bottom end might look like if this is what was smuthering the rockers and springs.
My oil pressure shoots straight to 80 upon start-up and takes a couple minutes to get below 60. Idles at 40 and cruises at 45-50 on the freeway going 65mph.
The top end was rebuilt and the bottom was left alone as I did not have the capitol to complete the rebuild. I am hoping to run this rig for another 25-35,000 miles before I buid a stroker. Its not my dd, right now it acts only as a trail rig so the milage it does see is harsh. It is not trailered so the occasional road trip is necessary to get to a desired spot. As you can see i am in fear of loosing compression soon in the first few cylinders (not all of them were scored)
I'm guessing I should stick to the thicker weights to keep it from flowing past the rings but what would you folks suggest?
Heres what was on the valves of the old head before it came off
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This I belive was due to either penziol or some sort of detergant the previous owner may have put in. It scared the [censored] out of me to think what the bottom end might look like if this is what was smuthering the rockers and springs.
My oil pressure shoots straight to 80 upon start-up and takes a couple minutes to get below 60. Idles at 40 and cruises at 45-50 on the freeway going 65mph.
The top end was rebuilt and the bottom was left alone as I did not have the capitol to complete the rebuild. I am hoping to run this rig for another 25-35,000 miles before I buid a stroker. Its not my dd, right now it acts only as a trail rig so the milage it does see is harsh. It is not trailered so the occasional road trip is necessary to get to a desired spot. As you can see i am in fear of loosing compression soon in the first few cylinders (not all of them were scored)
I'm guessing I should stick to the thicker weights to keep it from flowing past the rings but what would you folks suggest?
I'll give it a try
Do you even know if the previous owner use this oil? 
. I would expect more blow-by to be apparent due to (probably) better sealing valves on the alternate head. Usually engines decay as a unit. Sometimes when you redo the head ..you end up sending the combustion process out the only available door (the rings). Kinda like when one of two sloppy U-joints takes a [censored]. You replace it...now the other lame one takes up all the shock.
If your power level is decent enough, then it just comes down to consumption and blow-by management. Not a biggie if it performs as you desire and you're not changing plugs every 100 miles.
And I still have blow-by
No need for original system as I have eliminated the egr and replaced the air box with a conical filter.
MarkC
As far as oil weight, a 5w-xx should be fine for you. But if you are concerned, i see no harm in going with a 0w-xx. I don't know what to recommend for the second number as i'm not familiar with the Jeep engines, but i believe a lot of people say they like heavier weights like 40's. There are many excellent 5w-40's on the market that would probably work great.
