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Message: <blockquote data-quote="teejay" data-source="post: 161688" data-attributes="member: 51">no such thing as hot clearance......each material will hold different specific heat ,thus capacity will differ in the materials, thus giving a different expansion properties for each material, i.e. valve lash....after years of use, each valve will have different properties...even minute heat capacity will give different results i.e expansion of metal , so each valve adjust will differ. only way is to eliminate this factor, which is to perform the adjustment when there is zero heat, thus early morning before the sun rises or leave the car a whole day and adjustment made in mid of the nite......</blockquote>