Flex plate

[BuickSix]

Is this the correct flex plate for my 87 LC2?
I have a vibration, and this one seems warped and out of round.
Also, are they 160 tooth or 153? This one is 160.
When the starter turns it over it doesn't sound bad, but it doesn't sound good no matter how I shim the starter.
Thanks.

 

[pacecarta]

its a 3.8 turbo plate ,
the circle with the flat toward crank is for turbo pistons ,
small circle with flat toward teeth is for NA pistons,
4.1 has more small balance holes and will be stamped "4.1"
the 3.8 turbo flex plate is also available from pioneer fra-147 listed as 160 teeth

 

[David Husek]

Each plate is balanced to your engine. Try to find an original used replacement with similar balance holes and pins. The aftermarket ones are not close in balance. I have copied flexplate balance for customers in the past. Any questions feel free to contact me.