my wifes 2002 blazer just started what sounds like a valve tap. 1) can the lifters be adj.? she uses 5w-30 oil could 10w -30 help with this?
Also while looking this over I noticed coolant coming from the front corner of the intake, she told me shes had to add coolant a few times . Could one be causing the other????? I don't see water/coolant in the oil ..
I have seen a few collapsed lifters and even a few bad cams in these engines. The rocker arms are not adjustable, but it wouldn't hurt to pop off the valve cover and check the torque on the retaining bolts.
I would get that LIM gasket fixed up sooner rather than later. It won't get better.