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I've got a knock that is loudest at low rpm ('66 coupe, 302 2 valve). I've replaced the lifters, checked the tension on the rocker arms, and the rods are straight. My only conclusion is that the mechanical fuel pump is worn (the car has been sitting for four years). BUt before I go and start pulling parts I wanted to know if this is the right answer. Any opinions/suggestions are welcomed.
no it's possible...it could have the wrong F/P rod..and it's cheap to try so buy a new pump and a new rod from mr. gasket..also do you have power streering?