Do they tighten - or loosen?

And I love it when guys go "Motor's quiet, no need to adjust the valves!"
That makes no account for the valves being held open and burning since they cool through the seats! Be careful trying to make it quiet!

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Thanks never knew it. I go to spec and then increase the lash until I hear clacking, then back off a little. When I first got the truck, the valves were so out that I had to use a stethoscope with a rubber hose pickup to single out a valve since there was so much clacking everywhere.