"The sight of rival manufacturers reaping the rewards of a successful circuit racing programme prompted Ford to renew its alliance with engine builder, Cosworth, to create the Sierra. Assembly of the minimum 5,000 units required for Group A homologation commenced in June 1986 at the company's Genk plant in Belgium. Based on the three door Sierra bodyshell, the RS Cosworth combined the standard 1,993cc Pinto engine's cylinder block with a forged steel crankshaft and connecting rods, the first time the latter combination had been seen in a production Ford engine. Topping it off was a Cosworth developed, twin camshaft, 16 valve cylinder head fed by a Garrett AiResearch turbocharger, the latter being deemed necessary to achieve a competitive power output for racing, which in time would amount to over 500bhp! Even in standard road trim, the Sierra RS Cosworth produced a staggering 204bhp, its Weber-Marelli engine management system ensuring that the resulting stupendous performance was delivered with minimal turbo-lag. Needless to say, the standard Sierra underpinnings were comprehensively uprated to cope. 6,021 examples had been completed when production ceased in 1992, and today the model is highly sought after.With, remarkably, just one owner from new, this example of Ford’s flagship Sierra, the RS Cosworth, is offered in black coachwork and original grey Ford trim and is accompanied by a comprehensive 30 year service history. Originally purchased and registered on 23rd April 1987, this example has been serviced by our vendor’s local garage, Byfleet Ford, every year since new. All receipts and invoices are included in the history file together with the original order form, MoT valid until July 2019 and UK V5C registration document. The car also boasts all original stereo and seat covers.This is a Ford enthusiast’s dream; the car may not have been restored to concours standard and the mileage may not be sub 100,000, but few or no Cosworths can boast such comprehensive history from just one owner and, as such, we believe this is an incredibly collectable example."