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OK. This is for hydraulic lifters. With the valve COMPLETELY closed (at TDC both valves for #1 cylinder are closed) slowly tighten the adjustment nut while spinning the pushrod. You will feel resistance once the lash is removed. Most will say to tighten an additional 1/2 turn, but I've ended up with overtightened valves with a 1/2 turn, so I go another 1/4 turn instead. It's VERY important to make sure each valve is completely closed when you adjust it. Slowly turn the engine by hand and watch the valves. When one valve is completely open, the other valve for the same cylinder will be completely closed. You can't count on the other valve being fully closed if the other is only partially open because of valve overlap. For solid lifters the procedure is similar for cold lash settings. Slowly tighten the nut while sliding the feeler gauge until you feel it pinch the feeler gauge, but don't tighten it any more than that. You will need cam specs to find out what the cold lash setting is. The hot setting is recommended, and I set hot lash with the engine running, using oil deflector clips to make less of a mess.
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