Flexing a Flex Plate?

Dusterdenovo said

I didn't do that this time around, because I am replacing with the same* TC so figured a smooth swap. Originally, I did have to slightly egg out a couple of the holes for the after market "production variances". Having the flex plate bolted to the crank and the TC pilot hub engaged in the back of the crank is the only way I can think of (with my cardboard and PlayDoh) to ensure that both pieces are concentric before starting to massage bolt holes.

*almost the same

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I’d also be worried about how the centerline of the converter as mounted to the crank lines up with the trans centerline, the pump bushing won’t like anything being off as I believe that is mentioned in the B&M paperwork. Think rapid bushing wear and leakage. Line boring of the block changes alignment, and while an oem flexplate actually flexes and is more forgiving the B&M doesn’t and isn’t. Pretty damn rigid as I’m sure you’ve noticed. Have you checked crank pilot depth, and the converters pilot? Difference in positioning from block/trans mounting surface of the oem plate vs. the B&M? Likely some hardened sae washers (Hillman brand at better hardware stores) is all you’ll need but lots to check over.