My Impala Engine

Its gonna be messy-remove valve covers one at a time-start from the front valves-loosen it till it start clattering and tighten it till the noise stops and then turn 1-full turn do all of them this way and then go to the other bank-when valve adjustment is done-retime the ignition.

There is a less messy way they have rocker splash clip's they sell that will clip on to each rocker to reduce the amount of oil leaking all over. There pretty cheap highly recommended I own a set they work well. Just clip them on and adjust like rasmataz said.

With both forgot to mention that you adjust the valve lash while the engine is idling.

Or you can do it the hard way engine not running following the firing order-1843652 with a feeler gauge then fire it up then find the noisy ones gradually tighten it till it stops and apply 1/2 turn-

Sat9 I haven't done this since the late 80's I forgot about the clips to keep your eyes from burning and the running adjustment lol those were the days-Happy Holidays-see you in the Mod forum that's if it ever comes back-you know