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rich, ASE Certified Technician
Category: Car
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Experience:  ase master tech with L1--19+years of dealership experience
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intake exhaust manifold tightening squence 74 225 slant six

Resolved Question:

intake exhaust manifold tightening squence 74 225 slant six
Submitted: 7 years ago.
Category: Car
Expert:  rich replied 7 years ago.

here is the manual for a 1982 truck--it is the same motor and the info you requested would be the same


Fig. 1 Intake manifold tightening sequence. 6-225 (3.7L)




  1. Install new gasket between the exhaust and intake manifolds, then the three long screws holding the manifolds together. Do not tighten the three intake and exhaust manifold attaching screws at this point.
  2. Install new manifold to cylinder head gasket. Coat both sides of gasket with suitable sealing compound.
  3. Install manifold assembly then the washers as specified in Fig. 1. Install steel conical washer with cup side facing nut and brass washer with flat side facing manifold. Ensure all washers spanning intake and exhaust flanges are flat and free from distortion.
  4. Install nuts with cone side facing the washers, then torque all intake to exhaust manifold screws and manifold to cylinder head nuts to approximately 10 inch lbs.
  5. Torque inboard intake to exhaust manifold screw to specifications, then the outboard intake to exhaust manifold screws to specifications.
  6. Repeat step 5 until all three manifold screws are torqued to specifications.
  7. Torque manifold to cylinder head nuts to 120 inch lbs. in sequence shown in Fig. 1.
  8. Attach exhaust pipe to manifold flange, using a new gasket, then torque stud nuts to 35 ft. lbs.
  9. Install carburetor air heater, then the air injection tube, if equipped. Torque tube to 200 inch lbs.
  10. Install carburetor and connect fuel line, automatic choke rod and throttle linkage.
  11. Install distributor vacuum control line and carburetor bowl vent line.
  12. Install air cleaner, then connect breather cap to air cleaner line.
  13. Install air cleaner vacuum line to carburetor, then the flexible connector between air cleaner and carburetor air heater.


if you need more info--let me know

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