GM Inside - Ford Inside - Ford Ranger - Jeep - American Muscle

Support FSC and see no ads! - Click Here
Results 1 to 7 of 7

Header bolt torque specs?

This is a discussion on Header bolt torque specs? within the Technical / Maintenance forums, part of the General Discussion category; What do I torque the header bolts to on a gen III SBC with aluminum heads? 5.3L engine in 04 ...

  1. #1
    Registered User
    Join Date
    Nov 2004
    Location
    Arlington, Texas
    Age
    28
    Posts
    165

    Header bolt torque specs?


    Support FSC and see no ads! - Click Here
    What do I torque the header bolts to on a gen III SBC with aluminum heads? 5.3L engine in 04 silverado.

    Thanks guys,
    Lurius

  2. #2
    Supporting Member doglip's Avatar
    Join Date
    Oct 2005
    Location
    Oklahoma
    Posts
    983

    Re: Header bolt torque specs?

    Quote Originally Posted by Lurius
    What do I torque the header bolts to on a gen III SBC with aluminum heads? 5.3L engine in 04 silverado.

    Thanks guys,
    Lurius
    Not sure about headers but the stock exhaust manifold is torqued to 11 ft/lbs first pass and 18 ft/lbs final pass. I suspect those specs world work on headers also? good luck
    Diplomacy is the art of saying 'nice doggy' until you have a hand full of chunkin rocks.

    04'-K2500HD-LQ4-Westers 93 HOT tune

  3. #3
    Registered User
    Join Date
    Nov 2004
    Location
    Arlington, Texas
    Age
    28
    Posts
    165

    Re: Header bolt torque specs?

    Now im just having problems removing the bolts holding the stock headers onto the stock Y pipe lol.

    -Lurius

  4. #4
    Registered User
    Join Date
    Nov 2005
    Location
    Virginia
    Posts
    816

    Re: Header bolt torque specs?

    As I recall when I put my headers on a few months ago the directions said to torque to 15 pounds. It didn't say anything about a difference in heads.

    Have a nice day.

    Bill


    2005 Silverado 1500 LS 4x4 with Quadrasteer * BlackBear Performance Tune * 180 Thermostat * Airaid air intake * Dynatech Supermaxx headers with cats * Corsa dual side exit cat-back exhaust * 275/60/20 tires

  5. #5
    Registered User gmsuv's Avatar
    Join Date
    Aug 2006
    Location
    Michigan
    Posts
    177

    Re: Header bolt torque specs?

    I think this will help.
    If not let me know


    Document ID# 1458398
    2004 Chevrolet Chevy C Silverado - 2WD


    --------------------------------------------------------------------------------

    Cylinder Head Installation - Left
    Tools Required
    J 42385-100 Head/Main Bolt Thread Repair Kit
    J 45059 Angle Meter
    Caution
    Refer to Safety Glasses Caution in Cautions and Notices.






    Notice
    Clean all dirt, debris, and coolant from the engine block cylinder head bolt holes. Failure to remove all foreign material may result in damaged threads, improperly tightened fasteners or damage to components.



    Important
    Do not use the cylinder head bolts again. Install NEW cylinder head bolts during assembly.
    Do not use any type sealant on the cylinder head gasket, unless specified.
    The cylinder head gaskets must be installed in the proper direction and position.

    Clean the engine block cylinder head bolt holes, if required. Thread repair tool J 42385-107 may be used to clean the threads of old threadlocking material.
    Spray cleaner GM P/N 12346139 (Canadian P/N 10953463), GM P/N 12377981 (Canadian P/N 10953463) or equivalent into the hole.
    Clean the cylinder head bolt holes with compressed air.




    Important
    First design engine blocks have different drill and tap depths using both medium length 100 mm (3.94 in) and long 155 mm (6.1 in) M11 cylinder head bolts. Second design engine blocks use only the medium length 100 mm (3.94 in) bolt with a common drill and tap depth.


    Measure the depth of the cylinder head bolt holes (1-10) and select the correct length bolts as required.
    Check the cylinder head locating pins for proper installation.



    Inspect the displacement markings (1) on the gasket, for proper usage.




    Important
    When properly installed, the tab on the left cylinder head gasket will be located left of center, or closer to the front of the engine.


    Install the NEW left cylinder head gasket onto the locating pins.



    Install the cylinder head onto the locating pins and the gasket.
    Install the NEW cylinder head bolts.
    Notice
    Refer to Fastener Notice in Cautions and Notices.





    Tighten the first design cylinder head bolts. Tighten
    Tighten the first design M11 cylinder head bolts a first pass in sequence to 30 Nm (22 lb ft).
    Tighten the first design M11 cylinder head bolts a second pass in sequence to 90 degrees using the J 45059 .
    Tighten the first design M11 cylinder head bolts (1,2,3,4,5,6,7,8) to 90 degrees and the M11 cylinder head bolts (9 and 10) to 50 degrees a final pass in sequence to using the J 45059 .
    Tighten the M8 cylinder head bolts (11,12,13,14,15) to 30 Nm (22 lb ft). Begin with the center bolt (11) and alternating side-to-side, work outward tightening all of the bolts.
    Tighten the second design cylinder head bolts. Tighten
    Tighten the second design M11 cylinder head bolts (1-10) a first pass in sequence to 30 Nm (22 lb ft).
    Tighten the second design M11 cylinder head bolts (1-10) a second pass in sequence to 90 degrees using the J 45059 .
    Tighten the second design M11 cylinder head bolts (1-10) a final pass in sequence to 70 degrees using the J 45059 .
    Tighten the M8 cylinder head bolts (11,12,13,14,15) to 30 Nm (22 lb ft). Begin with the center bolt (11) and alternating side-to-side, work outward tightening all of the bolts.

    --------------------------------------------------------------------------------
    Document ID# 1458398
    2004 Chevrolet Chevy C Silverado - 2WD

  6. #6
    Registered User gmsuv's Avatar
    Join Date
    Aug 2006
    Location
    Michigan
    Posts
    177

    Re: Header bolt torque specs?

    This will help also


    Document ID# 826358
    2004 Chevrolet Chevy C Silverado - 2WD


    --------------------------------------------------------------------------------

    Exhaust Manifold Replacement - Right 4.8L, 5.3L, and 6.0L Engines




    Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
    Remove the exhaust manifold pipe nuts.
    Lower the vehicle.
    Remove the spark plugs. Refer to Spark Plug Replacement in Engine Controls - 4.8L, 5.3L, and 6.0L.



    Remove the exhaust manifold bolts, manifold, and gasket.
    Discard the gasket.



    Remove the heat shield bolts (1), and shield (2) from the exhaust manifold (1), if necessary.
    Clean and inspect the exhaust manifold. Refer to Exhaust Manifold Cleaning and Inspection .
    Installation Procedure

    Notice
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.






    Install the heat shield (2), and bolts (1) to the exhaust manifold (1), if necessary. Tighten
    Tighten the bolts to 9 Nm (80 lb in).






    Important
    Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance.
    The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material.


    Important
    Do not apply sealant to the first three threads of the bolt.


    Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953488), or equivalent to the threads of the exhaust manifold bolts.
    Install the exhaust manifold, NEW gasket and bolts. Tighten
    Tighten the bolts a first pass to 15 Nm (11 lb ft). Tighten the bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.
    Tighten the bolts a final pass to 25 Nm (18 lb ft). Tighten the bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.
    Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the front of the right cylinder head.
    Install the spark plugs. Refer to Spark Plug Replacement in Engine Controls - 4.8L, 5.3L, and 6.0L.
    Raise the vehicle.



    Install the exhaust manifold pipe nuts. Tighten
    Tighten the nuts to 50 Nm (37 lb ft).

    Lower the vehicle.

    --------------------------------------------------------------------------------
    Document ID# 826358
    2004 Chevrolet Chevy C Silverado - 2WD

  7. #7
    Registered User
    Join Date
    Nov 2004
    Location
    Arlington, Texas
    Age
    28
    Posts
    165

    Re: Header bolt torque specs?

    Wow, awesome, thats EXACTLY what I needed! Thanks man!

    -Lurius

 

 

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •