Pivoting water neck is die-cast, polished aluminum. The O-ring sealed water neck rises at a 90° angle and can be rotated 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.