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B&M#130-20413Holeshot 3000 Converter
B&M 20413 - B&M Holeshot Converters Details
Holeshot 3000 Converters
For 1965-91 GM TH375, TH400, and TH425 For 1968-81 TH350 and TH375B
GM vehicles with variable pitch transmission (some 1965-67 Buick, Oldsmobile, and Cadillac) must have pump and input shaft changed to fixed pitch design to use B&M converter
For 1968-81 TH350 and TH375B
B&M Holeshot Converters feature a furnace-brazed impeller and turbine, new turbine hub, new alloy steel pump drive tube, new heavy-duty needle bearing between stator and turbine (not a thrust washer), new springs and rollers in stator, and dual pattern drive lugs on some GM torque converters. Holeshots, which are also available in a Nitrous Series, are generally good for street machines that crave better launch capability and more tractability and street rods with modified engines. They are not for transbrake applications.RPM ranges for B&M Holeshot Converters:
Choosing a B&M Torque Converter
Stall Speed Very mild street cars use a 2000 RPM stall speed unit. Most street-driven performance cars with 350 foot pounds of torque or more need a 2400 RPM unit. Cars with more radical small blocks (500 foot pounds of torque at 4500 RPM or higher) require a 3000 RPM converter. The more torque a motor puts out, the higher the resulting stall speed. Therefore most street performance big blocks would still use a 2400 RPM converter because they generally achieve 2600-2800 RPM. An engine smaller than 350ci might not achieve such stall speeds, which are based on an engine producing 230 foot pounds of torque at 2500 RPM.
A Holeshot Converter's higher-than-stock stall speed is beneficial to vehicles with modified engines. Big cam modifications, for example, tend to reduce low end power and torque so using a high-stall converter allows an engine to launch a car at a higher RPM where more torque is available.