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