Chevy Straight Water Neck & 180 Degree High Flow Thermostat

Thermostat Housing Water neck is die-cast, polished aluminum. The O-ring sealed water neck rises straight up for best possible radiator hose access. Fits all Chevy V8's 1955-86 and accepts normal GM thermostats and 1-1/2" I.D. hoses. Includes hardware. Bolt hole dimension is approximately 3-1/4" center-to-center. Thermostat Speedway takes a quality Robertshaw 330-180 high flow 180° thermostat, then modifies it to function properly in high RPM, high flow applications. They feature a balanced sleeve design and are strongly recommended for any performance application. Fits most domestic applications. 2-1/8" diameter. High flow 180° thermostat. Balanced sleeve design. Recommended for any performance application. Fits most domestic applications. Learn more about the importance of the thermostat with cooling systems and how they work by reading our tech article, Cooling System Principles.