B&M 20481 Nitrous Holeshot 3000 Torque Converter, 1965-1991 GM TH400, TH425 & 1968-1981 TH350, TH375B

10 in. diameter, 10.75 & 11.50 in. bolt circles, 2800-3200 RPM stall

PART# 20481

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B&M Nitrous HoleShot 3000 stall for 1965-91 TH400, 425 and 1968-81 TH350, 375 transmissions (Not TH350C) is an excellent choice for vehicles with engine modifications, particularly big cams that tend to reduce low end power and torque. The higher stall speed of this converter will launch the car in a higher rpm range where more torque is readily available, resulting in quicker acceleration. Nitrous Holeshot converters feature furnace brazed impeller and turbine, new precision steel alloy pump drive tube, new heavy duty needle bearings between the stator and impeller (not a thrust washer) and needle bearings between the stator and turbine. Other features include dual pattern 10.75 and 11.50 in. bolt circle, a new turbine hub, new springs and rollers in the stator and anti-balloon plates. The anti-balloon plates will allow these converters to stand up to the instant horsepower that a nitrous plate system delivers. Stall speed listings are based on engines producing 230lb. ft. of torque at 2,500 rpm. More torque at 2,500 rpm will give you more stall speed, less torque at 2,500 rpm will give you less stall speed than the stall speed ratings indicated. These are serious converters for serious performance street cars. To prevent contamination left from worn parts being circulated in your new components causing premature wear, we strongly recommend protecting your investment by adding a B&M transmission cooler with all new transmission installations. Listed converters are NOT to be used in trans-brake applications. Not for use in trans-brake applications. Has both 10.75 and 11.50 in. bolt circles.


  • Needle Bearing Between Stator and Turbine
  • Higher Stall Speed, Quicker Acceleration
  • Anti-balloon Plate for Added Strength
  • Furnace Brazed Impeller and Turbine
  • Fully Balanced and Pressure Tested
  • Steel Alloy Pump Drive Tube
  • B&M Quality & Durability

Product Attributes

Emission Code5
Manufacturer Part Number20481
Product TypeTorque Converters
California Proposition 65 RequiredNo
Part Number20481



This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Tech Resources

For GM 1965 to 1991 TH400, TH425 and TH350. Also For GM 1968 to 1981 TH350 and TH375B. Does not fit TH350C models with locking torque converter


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