GM Firebird 1967-1981 Repair Guide

Exhaust Manifold

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REMOVAL & INSTALLATION 230 and 250 Engines



Exhaust manifold removal for these model years is covered in the Intake Manifold Removal and Installation procedure earlier in this section.

1975-76 Models See Figure 1

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Fig. Fig. 1: Tighten the exhaust manifold bolts in the sequence shown 1975-76 6-cylinder engines

  1. Remove the air cleaner.
  2.  
  3. Remove the power steering and air pump brackets.
  4.  
  5. Remove the EFE valve bracket.
  6.  
  7. Disconnect the throttle linkage and return spring.
  8.  
  9. Unbolt the exhaust pipe from the flange.
  10.  
  11. Unbolt and remove the manifold.
  12.  
  13. Reverse the procedure for installation. Tighten the four end-bolts to specifications last.
  14.  

231, 265, 301, 305, 326, 350, 400, 403 and 455 Engines

1967-74 Models

See Figures 2 through 7

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Fig. Fig. 2: Typical exhaust manifold mounting on 8-cylinder engines



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Fig. Fig. 3: To remove the exhaust manifold, first bend back the bolt retainers ...



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Fig. Fig. 4: ... remove the mounting bolts and manifold-to-exhaust pipe bolts ...



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Fig. Fig. 5: ... then pull the heat shields off of the manifold, if applicable



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Fig. Fig. 6: ... then pull the heat shields off of the manifold, if applicable



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Fig. Fig. 7: ... then remove the manifold from the engine compartment

  1. Remove the alternator and bracket as an assembly.
  2.  
  3. Disconnect the exhaust pipe from the manifold.
  4.  
  5. Remove the carburetor air preheater shroud from the manifold.
  6.  
  7. Straighten the tabs on the manifold bolt locks, remove the bolts and the manifold.
  8.  

To install:
  1. Clean the gasket surfaces and position the manifold on the engine, holding it in place with the two end bolts.
  2.  
  3. Insert the gasket between the manifold and the head.
  4.  
  5. Install the remaining bolts with new bolt locks and tighten them evenly to 30 ft. lbs. Bolt locks go only on the front and rear bolts.
  6.  
  7. Install the carburetor air preheater shroud.
  8.  
  9. Connect the exhaust pipe to the manifold and tighten to 30 ft. lbs.
  10.  

1975-81 Models

  1. If equipped with AIR, remove the air injector manifold assembly. The 1 / 4 in. pipe threads in the manifold are straight threads. Do not use a 1 / 4 in. tapered pipe tap to clean the threads.
  2.  
  3. Disconnect the battery.
  4.  
  5. If applicable, remove the air cleaner preheater shroud.
  6.  
  7. Remove the spark plug wire heat shields.
  8.  
  9. On the left exhaust manifold, disconnect and remove the alternator.
  10.  
  11. On models equipped with the 301 Turbo engine, the inlet pipe to the turbocharger must be removed from the right manifold; unscrew the three bolts and lift the pipe out of the way.
  12.  
  13. Disconnect the exhaust pipe from the manifold and hang it from the frame out of the way.
  14.  
  15. Bend the locktabs and remove the end bolts, then the center bolts. Remove the manifold.
  16.  

A9/16in. thin wall 6-point socket, sharpened at the leading edge and tapped onto the head of the bolt, simplifies bending the locktabs.

When installing a new right-side manifold on 1978 and later V8's, you must transfer the heat stove from the old manifold to the new one.

  1. Installation is the reverse of removal. Clean all mating surfaces and use new gaskets. Tighten all bolts to specifications from the inside working out.
  2.  

 
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