Chevrolet Full Size Cars 1979-1989

Crossover Pipe


Safety glasses should be worn at all times when working on or near the exhaust system. Older exhaust systems will almost always be covered with loose rust particles which will shower you when disturbed. These particles are more than a nuisance and could injure your eye.

V6 or V8 engines which are not equipped with dual exhausts utilize a crossover pipe so both manifolds can utilize the single exhaust system.


Click image to see an enlarged view

Fig. Fig. 1 When disconnecting the front of the crossover pipe, be sure to wire it to the frame in order to prevent damage to the rest of the exhaust system

  1. Raise and support the front of the vehicle safely on jackstands.
  3. Spray all fasteners which are to be disconnected using a penetrating oil.
  5. Remove the exhaust pipe-to-exhaust manifolds nuts.

The left side has an extension and packing; while the right side may be equipped with a heat riser valve assembly.

  1. If equipped, loosen the catalytic converter-to-transmission bracket.
  3. Remove the crossover-to-catalytic converter or intermediate pipe clamp and the pipe from the converter.

Check and lubricate the heat riser valve to make sure that it is operating properly.

To install:

  1. Add sealer to the connecting surfaces.
  3. Connect the crossover to the catalytic converter or the intermediate pipe, then loosely install the clamp.
  5. Connect the crossover to the exhaust manifold, then check the clearance and tighten the retaining nuts. Work backwards on the system to tighten the remaining fasteners.
  7. Remove the jackstands and carefully lower the vehicle.
  9. Run the engine and check for leaks, but be careful NOT to touch the hot exhaust pipes. Be especially careful near the catalytic converter, if equipped.