1987 Chevrolet V20 Suburban Engine: 5.7L V8; Standard Rotation; Optional Duty Thermal Fan Clutch;. 1987 Chevrolet V20 Suburban Engine: 7.4L V8; Standard Rotation; Severe Duty Thermal Fan Clutch;. 1988 Chevrolet V20 Suburban Engine: 5.7L V8; Standard Rotation; Optional Duty Thermal Fan Clutch; Fan Mounting Holes are 5/16 In.;.