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Are you saying that the int and ex valves in the same cylinder are hitting each other when you turn the motor over only in one diretion?????
How the %#!" is that possible???
Is the cam twisting in one direction?

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Cam does not twist, it is a physcical contact on the overlap of the valves, not unusual with bigger cams on the 426 hemi motors, be very careful when setting the cam up and make sure to check them like what has already been said to do the bigger the lift(.700+ and duration (286+)the more likely you can have a problem