Many vintage cars use a heat riser tube from the exhaust manifold or intake to the carburetor to operate the choke mechanism. Because these systems rely on hot exhaust gasses to operate properly they are prone to failure over time. Adding headers or aftermarket carburetors can also make the use of heat riser tubes impossible. A good solution is to convert the your car to an electric choke. Mark Simpson takes you step-by-step through the process of electric choke conversion.