Guess that part!

[rmk57]

 

   

[mustang6984]

   It is a retaining ring but I can't remember to what. I lost my mind in my last move...no idea where it went to. 

[gasman826]

part of the oil ring

[mustang6984]

Ah crapola...yep. Been a long, Long, LONG time since I built an engine...1978 if memory serves! Guess I will  now move to the back of the room and face the corner with a dunce cap on! 

[rmk57]

  Gasman pretty much got it. It's an aftermarket piece that goes in behind the the spacer part of the oil ring, I think they used call them oil ring expanders. I found them in my 429 a couple years back.

[rmk57]

   One more.......

                                   

[terry_208]

It bolts to the crankshaft with the flex plate between it and the end of the crankshaft?

[rmk57]

 Ding ding ding, we have a winner! Yes, it spreads the load out on the flexplate when it's bolted down.