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bolt order to place heads

This is a discussion on bolt order to place heads within the Internal Engine forums, part of the LSx Technical Help Section category; hi, someone knows where to get information about head bolt order and and tightning strenghts?...

  1. #1
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    black
    1999 Trans AM WS6

    bolt order to place heads

    hi, someone knows where to get information about head bolt order and and tightning strenghts?

  2. #2
    Member lrader99's Avatar
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    flat black
    autozone, napa, or GM dealer, they are torque to yield:
    Torque pattern:
    F 15____ 13____ 11____ 12____ 14
    R
    O 10____ 3_____ 1_____ 5_____ 9
    N
    T__ 7____ 6_____ 2_____ 4_____ 8

    -tighten bolts 1-10 first pass in sequence to 22 ft lb
    -tighten bolts 1-10 2nd pass in sequence an additional 90 degrees
    -tighten bolts 1-8 90 degrees and bolts 9 & 10 to 50 degrees in sequence

    -tighten bolts 11-15 to 22 ft lb begin with 11 alternating side to side working outward

    **very important...get a thread chaser and clean out the head bolt holes from the factory they have loctice on them you need to clean out all the crud or you will not get a proper torque rating and could possibly damage a thread

  3. #3
    Junior Member slpws6ta's Avatar
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    05 gto impulse blue
    00 WS6 custom paint

    if you didnt already know. you need to get new head bolts gm sells kits you need one kit per head they are like $20 per kit and the part # is 12498545 DO NOT REUSE YOUR OLD BOLTS. Also make sure you use compressed air to blow out the bolt holes with compressed air. If there is water, coolant, oil, anything down in those hole you will crack the block. Get some moly lube for under the head flange. thats the right way to do it.

  4. #4
    Junior Member slpws6ta's Avatar
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    05 gto impulse blue
    00 WS6 custom paint

    I just put my motor back in 2/7/07 after I did afull overhaul myself, just take your time that the best thing you can do
    00 ws6 m6 hurst
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    Mickey Thopson 26x11.5R17 ET STREET

  5. #5
    Junior Member greenvilleTA's Avatar
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    98 Trans Am

    I just finished building my motor as well...here's a good tip I found and am passing it on. Once you finish your 1st torque pass of 22 ft lbs, get a felt-tip marker (like a sharpie) and make a mark on the head of each bolt...preferrably at the 12 o'clock position. This makes it much easier to know when you've hit 90 degrees on the 2nd and 3rd pass...as well as the 50 degree bolts. Trust me, if the motor is in the car, you won't be able to turn the torque wrench an entire 90 degrees on all the bolts and the mark keeps you oriented...especially on the rear bolts

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