While the other Citations received trim and appearance changes for 1981, the Citation X-11 HO 660 (high output 6-cylinder, 60 degree) featured engine work and a suspension that would make you cry for joy. The HO engine emitted 18% more power than the stock V-6 via 9.0:1 compression, 3mm larger intake and exhaust valves, cross … Continue reading 1981 Chevrolet Citation VS K-Car Manufacturer Promo