Valve lash 'hot' adjustment results: 'ticking' sounds!?!? in Engine Posted 2 minutes ago · Report reply Engine must be HOT. Take for drive or idle at least 20 min. Gauge should read 1/2 or just above. Lash is 0.012" for all. Set TDC and do both on #1, intake on #2, exhaust on #3...... turn engine ONE full turn to TDC and adjust exhaust on #2 intake on #3 and both on #4. This is the fastest way to set the lash without the engine cooling down. If you can't do it in 10 min button up and warm it up before doing the last half. Assume the picture above is before starting? When you set the lash the rocker shafts and arms should have oil on them.