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HE stands for high efficiency. In the 70's the XKS was infamous for its poor gas mileage. In 1980, Swiss engineer Michael Mays was contracted to redesign the V12's heads, which resulted, in 1981, of the "HE" engine. Power and torque were increased, with a saving of up to 20% in gas mileage. The XKS is one of my favorite modern sedans, you're doing an excellent job on the model. Ettore
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