Stewart, Robert Shaw Thermostat 180 HYSXLG11PA ProStar 500

ProStar 500

1975-1978 GMC C25 Suburban CID 454 GAS

service kit for 13301 and 13351

protective coated for corrosion resistance (Carbon steel with Ptfe liners)

2001-2016 Chevrolet Express 3500

Stewart, Robert Shaw Thermostat 180 HYSXLG11PA ProStar 500For applications requiring a thermostat to keep the engine at operating temperature, we recommend using a Stewart Robertshaw high flow thermostat. This thermostat does not restrict flow when open. The Stewart Robertshaw thermostat enhances the performance of the cooling system, using any style of water pump. However, the Stewart Stage 1 high flow water pump may require this thermostat to operate properly, and Stewart Stage 2, 3, and 4 water pumps