[Steeveedee]

Not necessarily, though you could end up with low compression if the cam is too worn. About the only indication of that would be taking a lot of cranking to get up to pressure. It only requires taking the valve cover off and checking. Go here http://67-72chevytrucks.com/vboard/s...ghlight=hatzie

and download the '67 manual numbered 133. There is a procedure for checking cam lobe lift in the Engine section. Lobe lift should be about .231".