Exhaust Gasket - Front

Replacement of the front exhaust manifold gaskets on the 2008 Dodge Viper 8.4L V10, requiring removal of exhaust manifold components to access the cylinder head mating surfaces.

Warnings

Tools required

Parts

• Front exhaust manifold gasket set × 1 — Use OEM specification
• Exhaust manifold studs/bolts (if damaged) × 1 — Inspect during removal

Preparation

1. Ensure engine and exhaust system are completely cold to the touch
2. Park vehicle on level surface, apply parking brake, and place wheel chocks behind rear wheels
3. Disconnect negative battery cable to prevent accidental starter engagement
4. Raise front of vehicle and support securely on jack stands
5. Remove front passenger side wheel for improved access to lower manifold area
6. Spray all visible exhaust manifold fasteners with penetrating lubricant and allow to soak for at least 15 minutes

Procedure

1. 1

   Remove heat shields and covers
   Locate and remove any heat shields or protective covers over the front exhaust manifold. These are typically secured with fasteners along the top and sides of the manifold. Remove all fasteners and set shields aside. Note the location and orientation of any spacers or insulators for reinstallation.
2. 2

   Disconnect oxygen sensors
   Locate the oxygen sensor(s) mounted in the front exhaust manifold or front exhaust pipe. Disconnect the electrical connector(s) by releasing the locking tab and pulling apart. If sensors are threaded into the manifold, use an oxygen sensor socket to carefully remove them. Set sensors aside in a protected location to avoid damage to the tips.
3. 3

   Disconnect front exhaust pipe from manifold
   Locate the exhaust flange connection where the front exhaust pipe meets the exhaust manifold collector. Remove the flange fasteners (typically 2-3 nuts or bolts per connection). Separate the exhaust pipe from the manifold and support it with wire or a strap to prevent strain on downstream components. Remove and discard the old flange gasket.
4. 4

   Remove exhaust manifold fasteners
   Working from the outer ends toward the center, remove all exhaust manifold mounting fasteners that secure the manifold to the cylinder head. Remove all exhaust manifold mounting fasteners that secure the manifold to the cylinder head. The exact count should be verified against the factory service manual for this bank before removal. Apply additional penetrating lubricant if fasteners are difficult to loosen. If a stud breaks, mark its location for extraction or replacement.
5. 5

   Remove exhaust manifold
   Carefully work the exhaust manifold away from the cylinder head. The manifold may be stuck due to carbon buildup and corrosion. Gently tap the manifold with a rubber mallet if needed to break the seal, being careful not to damage the manifold or cylinder head surfaces. Remove the manifold from the engine bay.
6. 6

   Remove old gaskets
   Remove all old gasket material from both the cylinder head mating surface and the exhaust manifold mating surface. Use a plastic or brass gasket scraper to avoid scratching the sealing surfaces. Remove any remaining gasket material with a Scotch-Brite pad or similar abrasive. Clean both surfaces thoroughly with brake cleaner and wipe dry with shop towels.
7. 7

   Inspect mating surfaces and studs
   Carefully inspect the cylinder head exhaust ports and manifold mating surfaces for warping, cracks, or deep gouges. Check all exhaust studs remaining in the cylinder head for damage or excessive corrosion. Replace any damaged studs by removing with a stud extractor and installing new studs to the proper depth. If any studs broke during removal, extract the remaining portion with an appropriate extractor tool.
8. 8

   Position new gaskets
   Position the new exhaust gaskets onto the cylinder head studs, ensuring proper orientation with any embossed markings facing the correct direction (typically marked 'UP' or 'FRONT'). Verify that all gasket port openings align correctly with the cylinder head exhaust ports. Some gaskets may have a metal core or multi-layer construction; ensure they are seated flat against the head surface.
9. 9

   Install exhaust manifold
   Carefully position the exhaust manifold over the studs and onto the new gaskets. Ensure the manifold seats fully against the gaskets without pinching or displacing them. Thread on all manifold nuts or bolts finger-tight, starting from the center and working outward to help center the manifold on the gaskets.
10. 10

    Torque exhaust manifold fasteners
    Torque the exhaust manifold fasteners in three stages using a proper torque sequence (center to ends, alternating side to side). Torque the exhaust manifold fasteners in three stages using a proper torque sequence (center to ends, alternating side to side). Verify the OEM torque specification from the factory service manual for this vehicle before final tightening. Recheck all fasteners after the final torque pass to ensure none have loosened. Recheck all fasteners after the final torque pass to ensure none have loosened.
11. 11

    Reconnect exhaust pipe to manifold
    Install a new exhaust flange gasket at the connection between the exhaust manifold collector and the front exhaust pipe. Position the exhaust pipe to the manifold flange and install the flange fasteners. Torque flange fasteners in a crisscross pattern to the OEM specification found in the factory service manual to ensure even sealing pressure.
12. 12

    Reinstall oxygen sensors
    If oxygen sensors were removed from the manifold, apply a light coat of anti-seize compound to the sensor threads (avoiding the sensor tip) and thread them into the manifold by hand. Torque oxygen sensors to the OEM specification (typically around 30 ft-lbs, but verify in the factory service manual). Reconnect all oxygen sensor electrical connectors, ensuring the locking tabs engage properly.
13. 13

    Reinstall heat shields and wheel
    Reinstall any heat shields or protective covers removed in step 1, ensuring all spacers and insulators are positioned correctly. Install and tighten all heat shield fasteners. Reinstall the previously removed front wheel and torque lug nuts to specification, verifying which side corresponds to the front bank per the factory service manual. Lower vehicle from jack stands.
14. 14

    Reconnect battery and initial startup
    Reconnect the negative battery cable. Start the engine and allow it to idle. Listen carefully for any exhaust leaks at the manifold-to-head interface and the manifold-to-pipe connection. A minor hissing or ticking sound may be present initially as gaskets seat, but should diminish within the first few minutes of operation.

Reassembly

1. Installation follows the reverse order of removal with attention to proper gasket positioning and torque sequence
2. Always use new gaskets for exhaust manifold and flange connections
3. Allow engine to heat cycle fully and recheck for leaks after initial test drive

Verification

• Start engine and verify no exhaust leaks are present at the manifold-to-head interface (no hissing or ticking sounds after warm-up)
• Verify no exhaust leaks at the manifold-to-exhaust pipe flange connection
• Confirm oxygen sensor(s) are functioning properly with no check engine light or sensor codes
• After a short test drive and cool-down, recheck exhaust manifold fastener torque for any settling
• Verify no unusual exhaust odors in the engine bay or cabin

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