B&M Econo 11, Inch 2200-2600 Stall Torque Converter GM TH 350 & Th400, 10.75, Inch Bolt Circle, Each (BM400000)BM400000 TH350 TH400 STALL CONVERTER Suit TH400 & TH350, 2200 2600 rpm, 10. 75" bolt circle Part Number: BM400000 These Converters are budget priced and are intended for mild street engines up to 350 horsepower. They should not be used with nitrous, superchargers or transbrake but are perfect for street cars and hotrods. Stall speeds are based on an engine producing 230lb ft of torque at 2500 RPM. Engines with more torque will stall higher and less