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Valve adjusting is crucial with any engine. Basically what you do is rotate the crank pulley so that the crankshaft lines up with little timing marks on your engine. What this does raise piston #1 and #4 up to TDC. Then remove the valve cover and using the nuts on the rocker shafts, you adjust them to increase or decrease the space between the cam lobe and contact point on the rocker arm. This is called the "lash". If th space is too big or too small, you get clacking valves and increased rocker wear.
You need to get spacers to stick in the lash to measure the gap. For my car it's 0.007 to 0.009 inches for intake and 0.009 to 0.011 inches for exhuast. But they differ from engine to engine.
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Lookin at my gucci, it's about that time...
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