1988 Ford Sierra RS500 Cosworth #54/500

The Ford Sierra RS500 Cosworth (1987) was the ultimate Sierra. Just 500 built for homologation with larger turbo, intercooler, and fuel system producing 224hp standard (500hp+ in race trim). Moonstone Blue, whale-tail, and victory. Touring car legend (Tim Harvey, Andy Rouse). Values from £150k.

Sierra Cosworth: Engine - YB Cosworth turbo. Head gasket critical (especially early RS500s), timing belt every 36k, water pump, turbo (Garrett T3/T4). Strong if maintained. RS500 - even more stressed. Gearbox - T5/MT75 5-speed strong. 4x4 (Sapphire) - viscous coupling, transfer box. Body - Less rust than 70s Fords but check sills, inner wings. Rear spoiler expensive. Authenticity - Check chassis plate, build spec. Values rising - RS500 commanding serious money. Budget £4-8k annually.

RS500 (ultimate), 3-door RS (iconic), Sapphire 4x4 (practical), Unmodified, Matching numbers, Full history