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Circle Track 8 inch Powerglide Torque Converter - It is custom fabricated with furnace brazed fins, torrington roller bearings, extra thick anti-ballooning plates front and rear. Great for rules requiring a functional stock converters. Saves 10 pounds of rotating weight and is built to handle 900 hp. I paid $930 new and only used it for a half a season. Asking $550. It definitely made a noticeable difference in acceleration and lap times