Coolant Flow Restrictors Suits Chev Ford Holden Necks

restricting coolant flow leaving the engine lets you control the amount of heat absorbed by the coolant. Red, gold and blue anodised aluminium restrictor plates are mounted under the water outlet on the intake manifold. This 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.