B&M Nitrous HoleShot 3800 Torque Converter, 1965-91 GM TH400, TH425 TH375B, 1965-81 GM TH350

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Part
B&M 20485

B&M Nitrous HoleShot 3800 stall for GM 1965-91 TH400, TH425, TH375 and 1968-81 TH350, TH375B (not TH350C.) The Nitrous Holeshot 3800 stall converter 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 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 or fogger system delivers. 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.

  • Fully Balanced and Pressure Tested
  • Dual pattern 10.75 and 11.50-inch bolt circle
  • Needle Bearing Between Stator and Turbine
  • Furnace Brazed Impeller and Turbine
  • Anti-balloon Plate for Added Strength
  • Steel Alloy Pump Drive Tube
  • Higher Stall Speed, Quicker Acceleration
  • B&M Quality & Durability
More Information
PartB&M 20485
Manufacturer Part Number20485
UPC19695952952
BrandB&M
Bolt Circle Diameter (in)10.75
Emission Code5
MaterialSteel
Part TypeAutomatic Transmission Torque Converter
Stall Speed3500-3800
Transmission ModelTH400 TH425 TH375 TH350
Typeproduct
Item ReturnsThis item can be returned

Additional ContentsNew needle bearings
Anti Balloon PlateYes
Anti-Balloon PlateYes
Automotive Item GradeHigh Performance
Bolt Circle Diameter (in)10.75
BrandB&M
California Proposition 65 RequiredNo
Crank Pilot Diameter (in)1.71
Emission Code5
FlexPlate Bolt Circle10-3/4", 11-1/2"
Flexplate Change NeededNo
Furnace BrazedYes
LockupNo
Lockup TypeNo
MaterialSteel
Mounting StudsNo
Product TypeAutomatic Transmission Torque Converter
Stall Speed3500-3800
Torque Converter SeriesNitrous Holeshot
Transmission ModelTH400, TH425, TH375, TH350

  • Torque Converter
  • Mounting Hardware

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