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A defective cam is a possibility, but the binding valve spring far more likely. This becomes more likely if the machine shop that did your heads installed too many spacers under the spring to boost tension. When you replace the pushrod this time, replace the valve spring too, and take a hard look at the rocker arm to make sure it's correct and intact. A more remote chance is an incorrect pushrod, but if you've replaced them more than once it becomes more doubtful...
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"I think we have more machinery of government than is necessary, too many parasites living on the labor of the industrious." Thomas Jefferson
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