Ford Sierra, 1.8L 1988 to 1993 Head Gasket. 1.8 1988 - 1993 Petrol FORD SIERRA II (GBG, GB4) Rear-Wheel Drive Saloon | Sapphire R2C, R6A 87BHP. SIERRA II (GBG, GB4) Rear-Wheel Drive. 1.8 1988 - 1993 Petrol FORD SIERRA II Hatchback (GBC, GBG) Rear-Wheel Drive Hatchback R2C, R6A 87BHP.