1968-81 , , , Preheater Shroud to Cleaner Plastic Elbow. For Heat Riser Tube. This is the heat riser tube elbow, goes from the cleaner base to the exhaust manifold pre-heater shroud. One of these are used on all engines and the 4 uses 2 of these. These are used on all V8's and are a must for a concourse restoration. This is exact inline tube reproduction made identical to the original.