This item is a DSM Performance Products Pro-Touring 360 Degree Rotating Water Neck Kit

Black Anodised Aluminum, Manufactured from 6061-T6 Heat Treat Billet Aluminium, True Billet item in a high quality Anodised Finish. 

The o-ring sealed water neck rises at a 45° degree angle which can be rotated for best possible radiator hose location.

Measures 3-3/8" tall at the highest point. The bolt holes are 3-1/4" center to center.

Fits all Chevy V8's 1955-86, accepts normal GM thermostats and 1-1/2" I.D. hoses. 

They come with Bolts and O-ring seal for enhanced sealing.