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Flexplate
I'm not certain why the different sizes of flexplates. I think it may have something to do with some of the earlier small block that had a different bolt pattern for mounting the trans to the block.
I'm running a 351W with a C-4 and I'm using a 164 tooth flex, 28 oz. balance.
BTW, I'm swapping out the C-4 for an AOD and when I removed the C-4 and converter, I noticed that the flex plate is stamped AOD.
I think the 164 tooth is what you need.
Just my opinion, but wait to hear from some of the other gurus in here.
Tony
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