Hi, my name is Rob. I own a 74 620 and im running a u20 cam w53 head on an l16 with twin hitachi w38 flat tops and a k14 manifold.
My truck has been running crappie lately so I decided to replace the old points distributor with anew d4k match box. i went to put my motor to tdc with the valve cover off and noticed that the cam gear wasn't in line with the notch.
Here's the fun part, when I turn the motor, via the fan the cam gear moves independent of the cam
This is a running motor and every thing is thight. Could the pin on the cam have broken some how?