rockers on shaft moving fore/aft

just got this /6 about 2 months ago. Today i adjusted my valves (hot): .011 & .021 (my choice). i found that cyl 5 and cyl 6 rockers were moving fore/aft approx 1/8 or more, but staying on the pushrod, etc. (1966 Valiant, AT)

question: is this "normal", or should if look in my mirror and SCREAM!!??
stay safe. thanks