My 2002Siverado transmission went bed so I’ve been driving my panel daily. Kinda forced me to do updates I was putting off or ignoring. I put lap belts in and got all the lights, horn, and windshield wipers working. I tuned it up, adjusting the valves first then setting the timing. She’s running nice barely hear it, she has a speed limit of 50mph. More than that it starts to scream nasty things at me. Ok now my dilemma, after driving about 7 miles the valves start making noise, it has hydraulic lifters as it is a later engine. So when I say I adjusted the valves I did it according to the numbers in the manual. Intake .006-.008 exhaust .013-.015. I believe these numbers are for solid lifters? I haven’t found numbers for hydraulic lifters but have been told set up with zero lash plus a quarter turn? Which is it?