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Head Bolts!!

This is a discussion on Head Bolts!! within the GTO forums, part of the Vehicle Specific category; what kind of head bolts are used in an 04 GTO?? 1st design (2 bolts size 100mm and 155mm) 2nd ...

  1. #1
    Member pmolina0436's Avatar
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    Head Bolts!!

    what kind of head bolts are used in an 04 GTO??

    1st design (2 bolts size 100mm and 155mm)

    2nd design (1 bolt size 100mm)




    http://www.autozone.com/autozone/cat...entId=cat10008

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    Member 6.0LiterImportEater's Avatar
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    Why do you need new headbolts?

    Did you put on new heads or port/polish....any engine upgrades?

    If you have I would HIGHLY RECOMMEND ARP Headbolts! Nothing but the best!

    If you have it apart you can always measure the length.

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    Senior Member qwkgto's Avatar
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    I agree get ARP can reuse them and way stronger then those TTY that GM uses.

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    Veteran 0rion's Avatar
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    I think he's asking what size. I'm *pretty* sure the goats have just 1 size and not 2 like the earlier LS1's. Hopefully someone that's actually pulled the heads on an 04 will chime in.

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    cutting and welding mark21742's Avatar
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    Quote Originally Posted by 0rion View Post
    I think he's asking what size. I'm *pretty* sure the goats have just 1 size and not 2 like the earlier LS1's. Hopefully someone that's actually pulled the heads on an 04 will chime in.
    money was tight when I did mine so I ordered both sets from Autozone TTY bolts. mine was the old style(03 motor), but still used the new stlye bolts (all the same length) right at $30 per head for the bolts

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    Member pmolina0436's Avatar
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    Quote Originally Posted by 0rion View Post
    I think he's asking what size. I'm *pretty* sure the goats have just 1 size and not 2 like the earlier LS1's. Hopefully someone that's actually pulled the heads on an 04 will chime in.
    yea they were all the same size..

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    Member GTO1_OHIO's Avatar
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    Mine had two different sizes.

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    Veteran 0rion's Avatar
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    Quote Originally Posted by pmolina0436 View Post
    yea they were all the same size..
    Quote Originally Posted by GTO1_OHIO View Post
    Mine had two different sizes.
    what are the build dates on your cars? Wonder if there's any way to know what bolts you have prior to tearing it apart.

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    cutting and welding mark21742's Avatar
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    Quote Originally Posted by 0rion View Post
    what are the build dates on your cars? Wonder if there's any way to know what bolts you have prior to tearing it apart.
    07/03 (car) 04/03 engine build date here
    Last edited by mark21742; 04-01-2009 at 04:54 AM.

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    Member GTO1_OHIO's Avatar
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    Quote Originally Posted by 0rion View Post
    what are the build dates on your cars? Wonder if there's any way to know what bolts you have prior to tearing it apart.
    The car is 12/03, don't where to look for the engine build date.

    This is what I've found, mid-'04 GM switched from using 16 long (155mm) bolt and 4 short (100mm) bolts to 20 short ones.

    ARP part number(s) for the "long" and the "short" set up:

    134-3609 Long
    134-3610 Short
    Last edited by GTO1_OHIO; 04-01-2009 at 05:14 AM.

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    My car was made april 04 all the same length.

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    Member GTO1_OHIO's Avatar
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    Quote Originally Posted by mark21742 View Post
    07/03 (car) 04/03 engine build date here

    ????? Production didn't start on the GTO until September 9 2003.

    Quote Originally Posted by Yellow GTO View Post
    My car was made april 04 all the same length.
    That would be the 8th month of production.
    Last edited by GTO1_OHIO; 04-01-2009 at 05:40 AM.

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    Senior Member qwkgto's Avatar
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    Oh bullpucky, does it say 2004 on your title?then its a 04 ,mine says april 05 its a 05
    I think all the newer block 2004 and up have the same lenght bolts older ones its game of chance they changed the ls1 so many times only way to know is pull a few bolts out,hope you have the same lenght ones as the mismatched ones are alot ,are expensive.
    Last edited by qwkgto; 04-01-2009 at 06:37 AM.
    mods: custom built twins, built 408 w/l92 stock GM heads,GM matching intake,drag bags,frame ties,aluminum drive shaft, performabuilt 4l80e,Yank converter,ohios fastest and quickest 04-06 GTO 9.52 at 144mph. 1.50 60ft on stock rear end and shafts/suspension,on drag radials.

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    Member pmolina0436's Avatar
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    Quote Originally Posted by qwkgto View Post
    Oh bullpucky, does it say 2004 on your title?then its a 04 ,mine says april 05 its a 05
    I think all the newer block 2004 and up have the same lenght bolts older ones its game of chance they changed the ls1 so many times only way to know is pull a few bolts out,hope you have the same lenght ones as the mismatched ones are alot ,are expensive.
    true

  15. #15
    cutting and welding mark21742's Avatar
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    Quote Originally Posted by GTO1_OHIO View Post
    ????? Production didn't start on the GTO until September 9 2003.



    That would be the 8th month of production.
    crap, i was a year off on the car's build date, the car was built 07/04 i guess i shouldn't try to remember too many numbers when i'm two states away from my car and can't check to verify lol
    Last edited by mark21742; 04-02-2009 at 08:22 AM. Reason: wrong year

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