The final evolution of the Miura was presented in 1971 as the SV, with the 'V' for veloce, it didn't look like it but the SV was a lot improved over the S-model. The ventilated discs that appeared on the later S-models were again standard, and the chassis was further improved,
On the outside the most striking difference was the bulging of the rear wheel arches, they had to be widened by 13 cm because the Miura SV was fitted with the new Pirelli's, the suspension geometry was changed from lower triangles to lower quadrilaterals, because of these new tires the track had to be widened which needed the wheelarches to be redesigned.
The Miura SV was the fastest production car in existance at that time, and it would remain the fastest until the introduction of the Countach. But the SV wasn't faster than the S because the wider tires didn't allow a higher top speed despite an increase in horsepower.
The Miura SV was in fact not a true production Lamborghini, it was only built on specific order, and therefore only in very limited numbers, and after being in production for one year Lamborghini ceased production with a total of 150 SV's built. Today the Miura SV is a true collector's item.
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Information from Octane Magazine.