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Replacing the rocker is not too difficult. Carefully inspect the end of the push rod; if damaged or rough, replace it as well. Also inspect the valve stem and spring for any problems. If some debris limited the valve spring, or the valve stem had a burr that caused it to "stick", the push rod may have punched through the arm. Remember to set the lash when installing the rocker. Was this motor run a lot at WOT?