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Chuck: I would definitely follow the specs, and yes, you are at risk of damage if you run your truck for many hours. We have had loose settings hammer valve tips and push rods. Virtually all engines specify a closer setting on the intakes than exhaust because the exhaust valve gains stem...

I take exception to loose is better than tight. "Loose" needs to be clarified. If valve lash is too loose, performance degrades and the valve train parts get hammered to potenital destruction. The ramps on the cam lobes are designed to start gradually opening the valves with the correct lash. If...