Water outlet restrictor kit for GM V-8, GM V-6, Ford 260-302, and 351W.
Restricting coolant flow leaving the engine lets you control the amount of heat absorbed by the coolant.
Red, gold and blue anodized aluminum restrictor plates are mounted under the water outlet on the intake manifold.
Kit consists of three restrictor plates with 5/8″, 3/4″ and 1″ inner diameter holes for optimum coolant flow, 2-1/8″ outer diameter.