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 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. Ranges are for small and big blocks, mild to serious performance:
Holeshot 2000 1900-2100 RPM (mild performance)Holeshot 2400 2300-2500 RPM (mild to serious & Pro Street)Holeshot 3000 2800-3200 RPM (serious & Pro Street)Holeshot 3600 3400-3800 RPM (serious performance)
Nitrous Holeshot Converters should be used for all applications with 450 foot pounds of torque and all blown or nitrous applications.Choosing a B&M Torque Converter
Car Weight Street rods generally perform better using a 2400 RPM converter even with a mild motor due to the vehicle's light weight. A 2000 RPM converter tends to require too much braking effort when idling but a 2400 RPM unit remains comfortable and efficient.
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.
Tork Master vs. Holeshot Except for supercharged and nitrous engines, Tork Masters are a great value for most small block applications. Holeshots withstand much more torque and horsepower.
KEY (for below)
BC = bolt circle
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