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Message: <blockquote data-quote="stutaeng" data-source="post: 29415" data-attributes="member: 6175">Umm, not really. Or it depends on conditions on your heads. Higher mileage heads could benefit from valve stem seals, if anything else. When I did a DIY rebuild on my 06 Suburban LQ4 2 years ago (due to an intermittet lifter tick similar to OP's case), I had some refreshed 317 heads for another 6.0 I was slowly building, so I used those. The original heads were fine (even though they had 265k on them), but I still got them remachined/refreshed for the 6.0 I was slowly building. I would say that was optional for the remachining, but probably a good idea for the valve stem seals. You can replace the valve stem seals at home with a few basic specialized tools; no real need for machine shop. Just flip them over and add water and see if compressed air from the top of the valve causes air leaks.I have a friend that has like an 03 Tahoe with the 4.8 and has over 400k on the original. He says it burns a bit of oil, but otherwise runs good. At that mileage, remachining is probably necessary.</blockquote>