Water Outlet Restrictor Kit

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" i.d. holes for optimum coolant flow, 2-1/8" o.d.