1997 Chevrolet B7 Engine: 6.5L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch;. 1998 Chevrolet B7 Engine: 6.5L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch;. 2001 Chevrolet B7 Engine: 8.1L V8; Counter Clockwise; Severe Duty Thermal Fan Clutch;.