Still THE most prized of all latter-day performance Fords with many Blue Oval enthusiasts, the RS500 was built around a new Sierra RS Cosworth but given a YBD-series Cosworth engine. Gearbox and axle weren’t modified, and neither were the brakes or the suspension. All 500 cars built by the end of July but today the challenge is to find one that’s the real McCoy and not a clone. History is all-important, but it’s vital to thoroughly check any example you’re interested in. Colour-wise, black was the most popular hue, with 52 Moonstone Blue and 52 Diamond White making up the remainder.