1996 Chevrolet P30 Engine: 4.3L V6; Reverse Rotation; Severe Duty Thermal Fan Clutch;. 1997 Chevrolet P30 Engine: 4.3L V6; Reverse Rotation; Severe Duty Thermal Fan Clutch;. 1998 Chevrolet P30 Engine: 4.3L V6; Reverse Rotation; Severe Duty Thermal Fan Clutch;.