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.

For 1965-91 GM TH375, TH400, and TH425

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

Small (10.75" bolt circle) flexplate or dual-pattern flexplate required

For 1968-81 TH350 and TH375B

Does not fit TH350C

Does not fit lock-up converter or clutch converter models

Small (10.75" bolt circle) flexplate or dual-pattern flexplate required

More Information
Part Type Transmission & Drivetrain
Product Line Torque Converters
Brand B&M
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