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Thread: Maccas VX HSV GTS

  1. #46
    Maccas's Avatar
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    Re: Maccas VX HSV GTS

    Well i finally got the cam out, on the upside the cam isnt to bad but some small scores. On the down side it looks like the cam bearings are shagged, so looks like the engine is coming out completely!

    Cheers

    Ben
    It's Black , its waiting to pounce , the beast !! Soon to Awake

  2. #47
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    Re: Maccas VX HSV GTS

    Not good to hear Ben...but I guess you can pick what you do to it now

  3. #48
    Maccas's Avatar
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    Re: Maccas VX HSV GTS

    Yeah isnt ideal but am gonna pull the engine out and door all the bearing and clean everything else up!
    It's Black , its waiting to pounce , the beast !! Soon to Awake

  4. #49
    VBhero is offline Rarely Contributes to the Forum Last Online: 14-04-2018 @ 05:52 PM
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    Re: Maccas VX HSV GTS

    Quote Originally Posted by johnv View Post
    70thou is a lot off the heads, It may cause inlet manifold alignment problems and tight piston to valve clearences with a decent size cam.
    I wouldn't take much more than 20 thou off.
    Are you for real? 20thou?
    30 - 50 thou is quite common and no drama.

  5. #50
    Smashfist is offline Forum Contributor Last Online: 09-12-2019 @ 10:00 PM
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    Re: Maccas VX HSV GTS

    Those cam bearings are quite shagged. I've got an LS3 apart in the workshop at the moment that aren't half as bad as that.

  6. #51
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    Re: Maccas VX HSV GTS

    Quote Originally Posted by VBhero View Post
    Are you for real? 20thou?
    30 - 50 thou is quite common and no drama.
    Just speaking from experience, bought a set of heads with 50 thou off, and with a 0.605" lift cam I had piston to valve clearance issues, well under recommended minimum, and inlet manifold port alignment was not ideal.
    576 rwkw turbo m6 - 10.80 @ 136 mph

  7. #52
    Micks is offline Permanently Banned Last Online: 19-12-2021 @ 07:11 AM
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    Re: Maccas VX HSV GTS

    My estimate at 70 with stock pistons is a comp of about 12:1, what are you chasing?

  8. #53
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    Re: Maccas VX HSV GTS

    Remember the GTS is lower compression than a standard LS1, think from memory their 9.8 or 9.9:1. We had figured it would give around the 11.2:1 compression with 70 thou off the heads.
    It's Black , its waiting to pounce , the beast !! Soon to Awake

  9. #54
    Micks is offline Permanently Banned Last Online: 19-12-2021 @ 07:11 AM
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    Re: Maccas VX HSV GTS

    Quote Originally Posted by Maccas View Post
    Remember the GTS is lower compression than a standard LS1, think from memory their 9.8 or 9.9:1. We had figured it would give around the 11.2:1 compression with 70 thou off the heads.
    Ok you should be looking 80thou PTV with that cam then.

  10. #55
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    macca_779 is offline One of the Top Contributors to the Forum Last Online: 27-08-2023 @ 05:50 PM
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    Re: Maccas VX HSV GTS

    Quote Originally Posted by johnv View Post
    Just speaking from experience, bought a set of heads with 50 thou off, and with a 0.605" lift cam I had piston to valve clearance issues, well under recommended minimum, and inlet manifold port alignment was not ideal.
    Lift means very little when factoring in PTV. Duration and advance have far more of an influence.

  11. #56
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    Re: Maccas VX HSV GTS

    Quote Originally Posted by Micks View Post
    My estimate at 70 with stock pistons is a comp of about 12:1, what are you chasing?
    It will be about 11.2:1 with 70 off giving ~60cc chamber. Sure as shit won't be anywhere near 12:1. Not sure where you are getting that info from mate.

  12. #57
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    Re: Maccas VX HSV GTS

    Ok so for all the experts who think that 70 thou off a 241 head is crazy talk here is some data to show why its hardly a big deal.

    Stock LS1

    66cc chamber 10.15:1 comp



    Stock C4B head

    I didn't know the chamber vol of the C4B head so I worked my way backwards based off a 9.95:1 SCR getting a 68.4cc chamber



    So based on that info when I speced this build I was aiming for mid 11's for the SCR so taking into consideration it takes .007" off a head to drop 1cc (.005 if its off the block which i think might be why people are freaking out) I wanted to drop it 10cc. Hence 70thou. Its also going to be using LS2 gaskets which are a 4.020 bore which takes a little bit away ~.08:1 difference

    The end result should be around about this. which is no big stretch what so ever. If anything I'd like to go more, but lets not push the friendship with the heads to much.


  13. #58
    Micks is offline Permanently Banned Last Online: 19-12-2021 @ 07:11 AM
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    Re: Maccas VX HSV GTS

    Yes I was a little overzealous in my calculation, the dynamic figure will be lower than static comp

  14. #59
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    Re: Maccas VX HSV GTS

    Well the motor has been dropped off to get some meat taken off the heads and new bearings installed throughout the engine. Then the go fast parts will be installed and bring her back to life.
    Cant wait to have it back on the road have been missing driving it!
    It's Black , its waiting to pounce , the beast !! Soon to Awake

  15. #60
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    Re: Maccas VX HSV GTS

    Hurry up already

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