I appreciate the input of folks in the know.
That is what makes this forum great!
I have seen about 4 SBC Fluidampers that , for some reason the inner ring would not spin, turn, whatever. The engines performance would suffer and it took a while to locate the problem. Swap dampers and away they went. I have had 2 Mopar units with same issue. This is over a span of about 15 years.
I have to add, if you get an ATI and race with it in a No Pully situation you Better put bolts in the pully holes to keep that thing in one piece. I had a 500 CI BB Mopar that I was babysitting at the track one day--car ran 5.61, 5.60, 5.60 whatever and all of a sudden driver reported running over a rock or some object downtrack. Upon examination we discovered the ATI damper ring had left its hub and was gone. We dashed over to the flea market as this was a Mopar race/flea/show scrounged a stock damper, smacked it on and car went another few 5.60's so...You can have issues with any brand anytime.
Thanks for the professional input, I try to learn every day.