I’ve been around Ford FE engines since the 1990s. Even back then, they were already old-school engines. They are simple, tough, heavy, and built in a way that is different from a lot of the more commonplace engines people are more familiar with.

I’ve had hands-on experience with these engines over the years, and I have also spent time researching the details that matter when installing an FE intake manifold correctly. The FE engine family has a few quirks, especially when it comes to intake manifold fitment, gasket sealing, and distributor alignment. A lot of problems can be avoided by slowing down, checking the fit before final assembly, and following the correct torque procedure.

This guide is written for customers installing a Certified Automotive Experts aluminum intake manifold on a Ford FE engine. This information can also be applied to the factory cast iron manifold if the guidance on torque specification for the cast-iron manifold is followed. It is based on a combination of hands-on experience, factory publications, manufacturer recommendations, and practical installation methods used by experienced FE builders.

This information applies to Ford FE 352, 360, 390, 406, 410, 427, and 428 engines with low rise and medium rise cylinder heads. 

Certified Automotive Experts Technical Installation Guide

Intake Manifold Torque Sequence

Tighten the intake manifold bolts in the sequence shown here.  

Normally an intake manifold tightening pattern should start at the center of the manifold and work outward evenly. You will notice that Ford FE series engines have a slight variance from the norm on this. Following the proper torque sequence helps spread the clamping force across the intake gaskets and reduces the chance of leaks or misalignment.

Installation Procedure

Step 1. Clean All Surfaces

Remove all old gasket material from the intake manifold, cylinder heads, and block.

Clean the intake bolt holes and chase the threads in the cylinder heads with a thread chaser or bottoming tap if needed. The threads should be clean before final assembly.

Make sure all sealing surfaces are completely clean, dry, and free from old sealant, corrosion, oil, or debris. I recommend a final wipe down with a lint free shop towel and a small amount of brake parts cleaner sprayed onto the towel so did you can be certain that the surfaces are 100% clean and dry 

Step 2. Dry-Fit the Intake and Verify Alignment

Before installing sealant, set the intake manifold on the cylinder heads and check the fit. Setting the gaskets in place at this point is optional but don't worry about the end seals (China walls). 

Verify:

• Intake bolt hole alignment

• Port alignment

• Distributor engagement

If the heads or intake have been milled in the past, alignment can change. A dry-fit check helps catch those problems before sealant is involved.

Step 3 – Verify Distributor Engagement During Dry Fit

On a Ford FE engine, the cylinder heads primarily locate the intake manifold but the distributor plays a role too. It's very important to verify distributor fit and alignment as part of the dry-fit. With the intake still in the dry-fit stage, install the distributor and verify that it fully seats.

Check that:

• The distributor drops fully into place

• The oil pump drive engages

• The distributor rotates normally

After this has been confirmed, remove the distributor and continue with final installation.

Step 4 – Install the Intake Gaskets

Install the side intake gaskets on the cylinder heads.

A small amount of RTV or gasket adhesive may be used to hold the side gaskets in place if needed.

Step 5 – Seal the Front and Rear China Walls

Apply a continuous 3/8-inch bead of quality RTV silicone to the front and rear china wall surfaces. Don't use cheap silicone. Spend the extra money on the good stuff. You don't want to do this twice. 

Extend the RTV slightly onto the cylinder head surfaces at each corner. A very small amount of RTV should be applied to the top and bottom of the gasket where the gasket meets the bead of RTV. 

If rubber end seals are included with your intake manifold gasket set, Certified Automotive Experts recommends discarding those rubber end seals and using RTV sealant instead. This is a common FE installation method and helps reduce the chance of oil leaks at the front and rear of the intake.

Step 6 – Lower the Intake Manifold Straight Down

Step 6 – Position the Intake Manifold

Carefully set the intake manifold straight down onto the gaskets and RTV. With the manifold still loose, start the center bolts by hand first, then work outward and start the remaining bolts by hand. If needed, lightly snug a few center bolts only enough to compress the gaskets and help the outer bolts start. Do not force or cross-thread any bolt.

Step 7 – Install the Bolts Finger Tight 

Install all intake manifold bolts finger tight.

Before beginning the torque sequence, reinstall the distributor and verify that it still fully seats with the intake manifold in its final position.

Step 8 – Torque the Intake Manifold in Stages

Apply a few drops of clean engine oil to the bolt threads and under the bolt heads.

New intake manifold bolts are recommended.

Torque the intake manifold in three stages using the torque sequence shown above.

Stage 1:
15 ft-lbs

Stage 2:
20 ft-lbs

Stage 3 Final Torque:
25 ft-lbs

Torque Specifications

Certified Automotive Experts Aluminum Intake Manifold

Recommended Final Torque:
25 ft-lbs

This recommendation assumes:

• Cylinder head threads are clean

• Bolt threads are clean

• Threads have been chased if needed

• A few drops of clean engine oil have been applied to the bolt threads

• A few drops of clean engine oil have been applied under the bolt heads

• A torque wrench is being used

Factory Cast-Iron Intake Manifold Reference

For reference, the factory-style torque specification commonly used for a cast-iron Ford FE intake manifold is:

35 ft-lbs

That cast-iron specification is not the recommended final torque for this aluminum intake manifold.

Step 9 – Recheck Distributor Fit

After the intake manifold has been torqued to final specification, remove and reinstall the distributor one more time.

Verify that it:

• Seats fully

• Rotates normally

• Can be installed and removed without binding

This is an important final check on FE engines because intake manifold position and even the final tightening can affect distributor fit.

Step 10 – Heat Cycle and Retorque

Run the engine to normal operating temperature.

Allow the engine to cool completely.

After the engine has cooled, recheck the intake manifold bolts in the proper torque sequence and retorque to final specification if needed.

Important Installation Notes

Always use a torque wrench.

Do not torque bolts into dirty or damaged threads.

Do not install the intake with dry bolt threads.

Clean and chase the cylinder head threads before installation if needed.

Use clean bolts. New bolts are recommended.

Apply a few drops of clean engine oil to the bolt threads and under the bolt heads.

Start at the center of the manifold and work outward in a criss-cross pattern.

Recheck distributor fit before and after final torque.

Retorque after the first complete heat cycle.

Final Thoughts

The Ford FE engine is a great old engine, but it needs to be assembled with attention to detail. Intake manifold installation is one of those jobs where a little extra time up front can save a lot of frustration later.

Clean surfaces, clean threads, proper sealant placement, correct torque sequence, and distributor fitment checks all matter. None of it is complicated, but skipping those steps can lead to leaks, poor fitment, or having to do the job twice.

This guide is intended to help customers install their Certified Automotive Experts aluminum FE intake manifold correctly and with confidence. 

Ford FE 390 Intake Manifold Installation FAQs

1. What is the correct torque specification for a Ford FE aluminum intake manifold?

For the Certified Automotive Experts aluminum intake manifold, the recommended final torque specification is 25 ft-lbs. Tighten the bolts in three stages (15 ft-lbs, 20 ft-lbs, and 25 ft-lbs) using the proper Ford FE intake manifold torque sequence.

2. What is the torque specification for a factory cast-iron Ford FE intake manifold?

The commonly accepted factory torque specification for a cast-iron Ford FE intake manifold is 35 ft-lbs. This specification applies only to factory cast-iron manifolds and should not be used for aluminum intake manifolds unless specified by the manufacturer.

3. Should I use the rubber end seals or RTV silicone on a Ford FE intake manifold?

Certified Automotive Experts recommends discarding the rubber end seals included in many gasket kits and using a continuous 3/8-inch bead of high-quality RTV silicone on the front and rear China walls. This is a common practice among experienced FE engine builders and helps reduce the chance of oil leaks.

4. Why is a dry-fit important before final installation?

A dry-fit allows you to verify intake manifold alignment, bolt hole alignment, port alignment, and distributor engagement before applying sealant. This helps identify fitment issues caused by previously machined cylinder heads or intake manifolds and prevents costly installation mistakes.

5. Why should I check distributor fit during intake manifold installation?

On Ford FE engines, the intake manifold can affect distributor alignment. During both the dry-fit and final installation, verify that the distributor fully seats, engages the oil pump drive, and rotates freely to ensure proper engine operation.

6. Should intake manifold bolt threads be lubricated before torquing?

Yes. Apply a few drops of clean engine oil to both the intake manifold bolt threads and the underside of the bolt heads before tightening. Proper lubrication helps achieve accurate torque readings and consistent clamping force.

7. Do I need to clean and chase the cylinder head threads before installation?

Yes. Clean bolt holes and chase the threads with a thread chaser or bottoming tap if necessary. Clean threads help ensure accurate torque values and reduce the risk of damaged threads or uneven clamping.

8. Should I retorque the intake manifold after installation?

Yes. After the engine has reached normal operating temperature and cooled completely, recheck the intake manifold bolts using the proper torque sequence and retorque them to the recommended specification if necessary.

9. What Ford FE engines does this installation guide apply to?

This guide applies to Ford FE 352, 360, 390, 406, 410, 427, and 428 engines equipped with low-rise or medium-rise cylinder heads. The installation procedures are suitable for both aluminum and factory cast-iron intake manifolds when the correct torque specifications are followed.

10. What are the most common causes of intake manifold leaks on a Ford FE engine?

Common causes include dirty sealing surfaces, improperly cleaned bolt threads, incorrect RTV application, skipping the dry-fit process, improper torque sequence, over- or under-tightening the bolts, and failing to verify distributor alignment during installation.

Thank you for choosing Certified Automotive Experts.

Christopher Israel
Founder, Certified Automotive Experts LLC

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