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Originally Posted by JWR
Settings are for the correct amount of each.
They are checked with a feeler gauge to measure the thickness of the opening of each.
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Good bluff......but incorrect. :biggrin:
It is not the actual valve that is checked but the lash (gap) between the valve stem and the valve lifter or rocker arm. With wear over time that gap might change and need to be re-set.
How much the valve OPENS is determined by how the camshaft lobe is cut. That might change a bit with wear but it is not adjustable.