1968 Chevrolet P30 Van Engine: 4.8L L6; Standard Rotation|Standard Duty Thermal Fan Clutch;. 1969 Chevrolet P30 Van Engine: 4.8L L6; Standard Rotation|Standard Duty Thermal Fan Clutch;. 1970 Chevrolet P30 Van Engine: 4.8L L6; Standard Rotation|Standard Duty Thermal Fan Clutch;.