Water Restrictor Kit 5/8″, 3/4″, 1″ HoleÂ
• 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