New Coan Converter

This was a 4000 unit of unknown manufacture, in a small block powerglide brake car.

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When it did what it did, I replaced it with a custom munsinger (since retired, or....) that stalled at 5200, and picked up .2 and 3mph in the eighth.
Not a direct comparison obviously.
To be honest, look at a dyno sheet, and see how much more power you can make at 4500 compared to 3500. IF it dead hooks, I wouldn't be surprised by a tenth and a half (1/8).