Broken rocker arms two weekends in a row

pittsburghracer said

Adding to above post the exhaust is your issue so that is what I would like to see. Valve length differences between the intake and exhaust is common. Then you have the heavier thicker valve margin that comes into play. On a single shaft system like Mopars this really has to be though out. Sometimes a simple fix is a lash cap on one or the other.

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Thanks John, I'll have to look at the documentation that the previous owner gave me on the car. I know he included intake and exhaust valve lengths and diameters, along with spring diameter and spring pressure in the paperwork. I know the gentleman I bought the Arrow from is a pretty darn good engine builder and he told me in the 16 years he and his wife ran the Arrow they broke 4 rocker arms over those years.