odd knock counts

7747, built 350
When ever I get a knock count it will stay at that number from then on until ignition is cycled.If I tapp on the block the count will raise and stay raised.as I am tapping on block I can watch my timing lower and rpm lower when I stop tapping it returns to normal but the knock counts stays high.

That is normal. The knock counter is an accumulater. To find where you have knock counts you need to watch data frame by frame and see where they increase. Because after they increase they stay there till next time. It will roll over at 255 and start again.