Wikipedia によると:
1.6 L 4A-C I4 SOHC (North America & Australia) とあり、北米は 86 でもお安いエンジン積んでたのね。
で、DOHCエンジンを積んでいたのは AE88 というみたい:
Higher-spec AE86 models known as the Sport GT-S featured the DOHC 4A-GE, 4 wheel disc brakes, color matched bumpers, front lower bumper surround had a much more sporty and pronounced lip, door panels were molded, tachometer redline is around 7,500, wrapped steering wheel, seats had leather wrapped tops (front seats are completely different from Sport SR5), optional LSD, and aluminium wheels, chassis code in the VIN is AE88 (for North American market cars).