Replacement Of Original Helps Fuel Vaporization During Cold Engine Operation Directs Heat To The Base Of The Intake Manifold And Carburetor Increases Cold Engine Performance And Decreases Unburned Hydrocarbons And Carbon Monoxide A Malfunctioning Heat Riser Valve Negatively Impacts Derivability And Fuel Economy This El Camino replacement heat riser valve has been manufactured to meet or exceed factory specifications and performance. You will find the fit and function will work perfectly for your vehicle. You will also be pleased to know that the El Camino Store has sourced this heat riser valve among other possible parts as the best choice for your repair or restoration project.