JEGS Water Restrictors
Allows you to control the rate of heat absorption from the engine block and heat dissipation from the radiator in race-only applications. Used by professional engine builders to obtain optimal temperature control and maximum power. Kit includes 3 anodized discs: 5/8" ID, 3/4" ID, and 1" ID. Color coded for easy identification. Fits most AMC, Ford, and GM V6/V8 engines with 2-1/8" OD thermostat. Made in the USA.