Hi my name is Chris I just bought a 1978 malibu 4 door with 70,000 original miles so the title say's. and It had a skip so I replaced all the plugs wires cap and rotor still the same so I took off the valve cover only to find that a few of the valve weren't moving so I thought bad lifters. I just replaced all the lifters and still the same ones aren't moving has anyone heard of a camshaft wearing out this bad within 70,000 miles? or is the odometer off?