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Jpninpa, the ticking gets worse when the engine and oil are at operating temp. I was going to try using an sae 30w oil and see what happens. I have no idea what the original owner had been using for oil.

One thing I did notice when I replaced the oil pump, the original mounting gasket had two holes in the top. I did also notice a drilling in the block near the oil pump mounting area. What is that for?

I have had the valve cover off and inspected the overhead. None of the valve lashes were excessively loose.

The engine is the original 4.2L 258. I have added some atf to the oil and it does help. What is the next direction? New cam and lifters?

I bought an 85 CJ7 with the 4.0L that had been sitting for 6 years. Engine was not seized. The engine had good oil pressure and lifters were not noisy. After changing the oil the lifters are now noisy and the noise does not stay in the same area of the engine. I have used 5w30, 10w30 in an...