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Thread: Timing mark's on Vortec 5.7

  1. #1
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    Default Timing mark's on Vortec 5.7

    Howdy all,
    Me again!
    I have noticed a lack of excitement on my ECU supplier's behalf to help me any more than they have.
    So to this end i have decided as my back-up plan to replace the dizzy with a electronic style jobbie that they might be able to get right, thus eliminating my CAS as a problem.
    I was having a look under the car for the timing marks on the harmonic balancer/timing cover. and cannot find the one on the timing cover.
    Is it removeable? or is it cast into the plastic timing cover itself?
    I have been told that i have to line up the 2 line's on the pulley/timing cover and then the 2 line's in the dizzy will be lined up as well.......The one's on the timing cover being TDC on number1 and the one's in the dizzy being 'On the rock' on number 8, is this correct?
    Can anyone help me?

    Thank's in advance,

    Steve.

  2. #2
    Lifetime Member Aloicious's Avatar
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    Quote Originally Posted by Vortec Patrol View Post
    Howdy all,
    Me again!
    I have noticed a lack of excitement on my ECU supplier's behalf to help me any more than they have.
    So to this end i have decided as my back-up plan to replace the dizzy with a electronic style jobbie that they might be able to get right, thus eliminating my CAS as a problem.
    I was having a look under the car for the timing marks on the harmonic balancer/timing cover. and cannot find the one on the timing cover.
    Is it removeable? or is it cast into the plastic timing cover itself?
    I have been told that i have to line up the 2 line's on the pulley/timing cover and then the 2 line's in the dizzy will be lined up as well.......The one's on the timing cover being TDC on number1 and the one's in the dizzy being 'On the rock' on number 8, is this correct?
    Can anyone help me?

    Thank's in advance,

    Steve.
    there's a notch in the side of the balancer and one cast into the timing cover. the notch on the timing cover is at about 2 o'clock.

    you can kinda see them at the very bottom of this pic:
    1996 c1500 gen1e 5.7L - the "LS31", 24x CNP, LS2 coils, modified T56, 12200411PCM running COS3, zz4 cam, custom MPFI, etc. coming soon: Twin Turbos

  3. #3
    Lifetime Member hquick's Avatar
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    Is there any reason you can't run the truck with an LS1 PCM?
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

  4. #4
    Lifetime Member Aloicious's Avatar
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    I should have also mentioned that when those timing marks are ligned up, its EITHER TDC compression for #1 OR #6, have your valve covers off and go back and forth a little watching which valves move to determine which cylinder is at TDC, an extra 180* will bring the other cylinder to TDC.
    1996 c1500 gen1e 5.7L - the "LS31", 24x CNP, LS2 coils, modified T56, 12200411PCM running COS3, zz4 cam, custom MPFI, etc. coming soon: Twin Turbos

  5. #5
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    Quote Originally Posted by hquick View Post
    Is there any reason you can't run the truck with an LS1 PCM?
    I dunno,.....is there?
    I have no idea about this engine hquick!, i would be wrapped if it was as easy as that!
    If so i have alot more question's on how to do that!

    Steve.

  6. #6
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    Quote Originally Posted by Aloicious View Post
    I should have also mentioned that when those timing marks are ligned up, its EITHER TDC compression for #1 OR #6, have your valve covers off and go back and forth a little watching which valves move to determine which cylinder is at TDC, an extra 180* will bring the other cylinder to TDC.
    Cheers Aloicious,
    Love the name!....it is my 'aka' name! 'Aloicious Wheelbarrow'
    No drama's! thank's for the pic! make's a heap of sense.
    I will pull the rocker cover off when i do it.........if i do it!
    No wonder i couldnt find it, it's in a bitch of a spot!

    Steve.

  7. #7
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    Man......I am wrapped with this site!
    You bloke's on here are great! I have learnt more about my engine in the last week than in the 3 year's ive owned it for.
    Everyone on here has been great and very helpful, and this would be in the top 2 of the forum's i have registered too.
    Thank's again, your patience with a bloke like me that is a bit knowledge challenged with this engine, your help is fantastic.

    Steve.

  8. #8
    Lifetime Member Aloicious's Avatar
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    Quote Originally Posted by Vortec Patrol View Post
    Cheers Aloicious,
    Love the name!....it is my 'aka' name! 'Aloicious Wheelbarrow'
    No drama's! thank's for the pic! make's a heap of sense.
    I will pull the rocker cover off when i do it.........if i do it!
    No wonder i couldnt find it, it's in a bitch of a spot!

    Steve.
    no problem, "Aloicious Jones" is the fake name I used to order pizza with as a kid. heh...

    Hquick is correct, you CAN run a LS1 PCM with your engine, both him and I are running a 2002 12200411 PCM on our L31 vortec 5.7's. here's some info on it if its something you're interested in:
    http://www.pacificp.com/forum/viewtopic.php?t=3240
    its a long thread but full of good info

    let us know if you have other questions.
    1996 c1500 gen1e 5.7L - the "LS31", 24x CNP, LS2 coils, modified T56, 12200411PCM running COS3, zz4 cam, custom MPFI, etc. coming soon: Twin Turbos

  9. #9
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    Quote Originally Posted by Aloicious View Post
    there's a notch in the side of the balancer and one cast into the timing cover. the notch on the timing cover is at about 2 o'clock.

    you can kinda see them at the very bottom of this pic:
    I noticed in your photo that there are no guide plates for the pushrods. How is that going to work?

  10. #10
    Joe (Moderator) joecar's Avatar
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    That rocker roller tip is designed to self-align on the valve tip, so guide plates are not needed.

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