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How Not To Build A High-Stall Converter
Notice how the "builder" of this 298mm converter was going for "maximum" stall speed here. Unfortunately, in creating the highest stall speed, he also created a giant heat pump incapable of good hydraulic lockup, and wasting engine horsepower that would have never made it to the rear wheels. Note how the center fins have been bent over with a chisel and the outside fins are bent at the most negative fin angle possible. If the builder had selected a smaller cover and pump to begin with, the high stall could have been achieved without sacrificing the efficiency of the converter. These kinds of decisions are usually the result of someone who needs lots of stall, but has very little money to spend.