Exhaust Manifold Studs

Replace broken or damaged exhaust manifold studs on the 8.3L V10 engine, requiring exhaust header removal and stud extraction.

Warnings

Tools required

Parts

• Exhaust manifold studs × 10 — Use OEM specification
• Exhaust flange gaskets × 2 — Use OEM specification
• Oxygen sensor anti-seize compound × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and allow exhaust system to cool completely (minimum 4 hours after last operation)
2. Disconnect negative battery cable
3. Apply penetrating oil to all exhaust header flange bolts and oxygen sensor threads
4. Raise vehicle on lift or support securely on jack stands if additional clearance is needed
5. Have fire extinguisher readily available when working near exhaust components

Procedure

1. 1

   Remove oxygen sensors
   Using an oxygen sensor socket, remove the oxygen sensors from the exhaust headers on both banks. The Viper V10 has pre-cat oxygen sensors mounted in each header collector. Label sensors for correct reinstallation (left/right bank). Inspect sensor threads and apply anti-seize to threads only (avoid contaminating sensor tip) during reinstallation. Note: If the oxygen sensors are not pre-coated from the factory, apply only OEM-approved oxygen sensor anti-seize to the threads (avoid getting anti-seize on the sensor element). Many OEM sensors come pre-coated and require no additional compound.
2. 2

   Disconnect exhaust at collectors
   Locate the exhaust flange connection points where the headers meet the exhaust system (typically at the collector outlets). Remove the flange bolts securing the exhaust pipes to the header collectors. Support the exhaust system weight to prevent strain on remaining hangers. There are typically 3 bolts per flange connection.
3. 3

   Remove heat shields
   Remove any heat shields covering the exhaust headers. These are typically secured with small bolts or clips around the header tubes and may include shields protecting adjacent components. Note the orientation and mounting locations for reinstallation.
   Torque spec

   Heat Shield Bolts10 Nm (7 lb-ft)
4. 4

   Remove exhaust header mounting hardware
   Working from the outside of each bank toward the center, remove the nuts securing the exhaust headers to the cylinder head studs. The V10 has 5 exhaust ports per bank. Verify the number of studs per port against the OEM manifold flange configuration (many V10 manifolds use multiple fasteners per port). If any studs rotate or pull out with the nuts, mark their locations. If any studs rotate or pull out with the nuts, mark their locations. Use penetrating oil and heat if necessary for seized fasteners. Support the header weight as the last fasteners are removed.
5. 5

   Remove exhaust headers
   Carefully maneuver each exhaust header away from the cylinder head. The headers are heavy and may require rotation to clear surrounding components. Inspect the header gasket surfaces and mating surfaces on the cylinder head for damage or warping. Remove old gasket material from the cylinder head face using a plastic scraper (do not gouge the aluminum surface).
6. 6

   Assess broken studs
   Identify which studs are broken, damaged, or need replacement. Clean the area around each broken stud with a wire brush. If the broken stud protrudes above the cylinder head surface, attempt removal with locking pliers or a stud extractor. If the stud is broken flush or below the surface, proceed with extraction drilling.
7. 7

   Extract broken studs
   For studs broken below the surface: Use a center punch to mark the exact center of the broken stud. Verify the actual exhaust stud thread size for this engine before drilling. Select a left-hand drill bit approximately 2/3 the diameter of the stud minor diameter (for M10 studs this is approximately 5-6mm, but confirm the correct size for the verified stud dimension). Drill slowly and perpendicular to the cylinder head face, maintaining alignment. Cover adjacent exhaust ports with shop towels to prevent debris entry. Often the stud will unscrew as the left-hand bit bites. If not, use a screw extractor appropriate for the hole size drilled. Apply penetrating oil during the process.
8. 8

   Clean and repair threads
   Once all broken studs are removed, clean the threaded holes thoroughly with brake cleaner and compressed air. Run the correct-size thread chasing tap through each hole to clean and restore threads (verify the exact thread size and pitch for the OEM exhaust stud before selecting the tap). If threads are damaged beyond cleaning, consult a machine shop for thread insert installation (Helicoil or Time-Sert). Ensure all holes are clean and free of debris before proceeding.
9. 9

   Install new exhaust manifold studs
   Apply anti-seize compound to the threaded portion of new studs that threads into the cylinder head (not the nut-engagement end). Thread each stud into the cylinder head by hand, ensuring it threads smoothly without cross-threading. Use a stud installation tool or double-nut method to tighten studs to proper depth. The studs should be seated firmly with equal thread engagement visible above the cylinder head surface on all positions. Install studs to the OEM-specified depth using the double-nut method (installation torque for the 8.3L V10 must be verified against Dodge service documentation before applying a figure). Verify that studs bottom properly in their holes.
10. 10

    Install exhaust headers
    Position new exhaust gaskets on the cylinder head studs, ensuring proper orientation (gaskets are typically port-matched and may be directional). Carefully maneuver the exhaust header into position, guiding all studs through the header flange holes. Start all nuts on the studs by hand before tightening any. Working from the center outward in a crisscross pattern, tighten the header nuts gradually in multiple passes to the specified torque. Apply anti-seize to the nut threads before installation.
    Torque spec

    Exhaust Flange Bolt45 Nm (33 lb-ft)
11. 11

    Reinstall heat shields
    Reinstall heat shields in their original positions, ensuring proper clearance from header tubes and surrounding components. Tighten heat shield mounting hardware to specification.
    Torque spec

    Heat Shield Bolts10 Nm (7 lb-ft)
12. 12

    Reconnect exhaust system
    Align the exhaust pipes to the header collector flanges. Install new gaskets if the originals are damaged. Install flange bolts with anti-seize compound and tighten in a crisscross pattern to draw the flanges together evenly.
13. 13

    Reinstall oxygen sensors
    Apply anti-seize compound to the threads of each oxygen sensor (avoid getting anti-seize on the sensor element). Install sensors in their original positions (left/right bank) and tighten to specification using an oxygen sensor socket.
    Torque spec

    O2 Sensor45 Nm (33 lb-ft)

Reassembly

1. Reconnect negative battery cable
2. Start engine and allow to reach operating temperature while checking for exhaust leaks at header flanges and collector connections
3. After initial heat cycle, recheck header nut torque when engine has cooled (thermal cycling may require retorque)
4. Clear any diagnostic codes related to oxygen sensor disconnection if check engine light illuminates

Verification

• Visually inspect all header flange nuts and exhaust connections for proper seating
• Start engine and listen for exhaust leaks at header-to-head interface (ticking or hissing sounds indicate leaks)
• Check for exhaust odors in cabin with engine running
• Verify oxygen sensor signals are reading properly using scan tool (no sensor heater or signal codes)
• After test drive, recheck header nut torque and flange bolt torque when engine is cool

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

Chasing one of these codes and not sure which part is guilty? Ask a master mechanic about YOUR car →

More procedures for this vehicle