www.QV500.com - Lamborghini Urraco Part 4: P300 Urraco 'Experimentale'
 

A particularly interesting Urraco was Bob Wallace's experimental hot rod. Built on a prototype P250 chassis at the factory by Lamborghini's chief test and development driver in his spare time throughout 1973 and '74, it is often referred to as the Urraco Rallye and sometimes Urraco Bob. Extensively modified, much like the Jota and Jarama that preceded it, Wallace fitted adjustable Koni dampers and reinforced the subframe. Various other inserts were formed from a mixture of steel and alloy to further stiffen the chassis. Weight was cut from the car wherever possible and the brakes were also enhanced.
   

Wider Jota-style Campagnolo magnesium racing wheels were fitted, these necessitating heavily flared wheelarches, other bodywork alterations including a deep wraparound chin spoiler. All the old steel body panels were junked and replaced with a lightweight alloy shell, a huge rear aerofoil later being added. The cabin was stripped of the road cars luxurious fixtures and fittings, Wallace installing a custom fuel tank where the rear seats originally were and adding a roll cage. Dropped into this was a dry-sumped three-litre V8 with an all-new four-valve cylinder head. Pumping out 330bhp, Lamborghini's highly experimental engine was coupled to an equally state-of-the-art six-speed gearbox. With two unsilenced racing exhausts, the sound must have been electrifying. Rumoured to have once raced unofficially at Misano, Wallace and the Urraco reputedly lapped an entire field of Porsche RSR's within nine laps.