1989 Chevrolet V1500 Suburban Engine: 5.7L V8; Reverse Rotation; Optional Heavy Duty Thermal Fan Clutch; Fan Mounting Holes are 10 mm.;. 1990 Chevrolet V1500 Suburban Engine: 5.7L V8; Reverse Rotation; Optional Heavy Duty Thermal Fan Clutch; Fan Mounting Holes are 10 mm.;.