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Thread: LSJ head on L61? PICTURES AND THE ANSWER

  1. Top | #13
    Official Forum Whore Array DaFlyinSkwirl's Avatar
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    all that stuff is identical

    the power steering pump bolts right in and you can use the LSJ cam. if you want, you can use the L61 cam since the intake side is the same length.

    the only cam that messes you up is the exhaust cam

  2. Top | #14
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    i see..now to find a cheap lsj head

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    Ok.. Let me get this Straight...the LSJ is Completely a Bolt on to the L61 Block? BUT you have to use the the LSJ Intake and Exhaust Manifold or Custom manifold on the LSJ Head on the L61 Block?

    I have Read this thread like 3 times.But alil confused. Im very interested in the Swap. and No one would Expect i made a Hybrid motor and they would think it's stock (where i live). I just want to make it clear an understand this!

    Also if you did this swap. would you need the LSJ Head Gasket or L61 Hasket? or they are the same?

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    and to add. Do you just leave the LSJ Internals in the head, and everything will be fine?

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    a couple things you guys were asking about...

    so far as I know, the cam gears and chain are the same.. however, I wouldn't run the LSJ cams in the L61 n/a.. if you're boosted, you should be ok.. but the cam profiles of a s/c car in an n/a car won't run very well or strong

    the intake manifold poses a bit of a problem.. you can run either the saab 9-3 turbo manifold (which bolts up perfectly), or run a custom intake mani. I'm still working on a way to get around this by modifying the head in the garage but i'm working on that still.

    the exhaust mani/header is a direct bolt on, nothing to worry about there.

    power steering pump is a direct bolt on

    thats about all I think.. again I can't think of everything cuz I haven't actually done the swap yet but I am soon

  6. Top | #18
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    there was a thread on here somewhere that said the lsj and l61 cam profiles are the same, just timed different?

    Also with concern to having extra meat for porting, is that really necessary?
    Patriot takes l61 cores for purchases from them, and thier heads flow good.
    hmmm; maybe that's why GMPP heads flow better, they start with an lsj type casting.

    oh, and when this is finished/stickied a list of pros/cons to the swap would be sweet.

    Nothing is difficult; some things just take more time.
    TAKE TO EXTREMES AND DOMINATE!

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    there was a thread on here somewhere that said the lsj and l61 cam profiles are the same, just timed different?
    thewizard Quoted Post
    yes but it isn't specified how they made the change. they could have either changed the cam grind to time it differently, or made different gears for them.. I doubt it, I'd suspect its a different grind for the cams.. especially since the LSJ has 2 long cams and the L61 has one long one short

    Also with concern to having extra meat for porting, is that really necessary?
    Patriot takes l61 cores for purchases from them, and thier heads flow good.
    hmmm; maybe that's why GMPP heads flow better, they start with an lsj type casting.
    patriot heads barely touch the exhaust ports.. there's a lot of room for improvement, and they're flow numbers are better than stock but I wouldn't say much more than that.

    GMPP heads flow more because GM actually attacks the exhaust side a bit.. but the area around the ports back there is literally paper thin.. unless the 2005 heads have that gap filled in then it would be ok again.

    The LSJ head (all of them) have a decent amount around the exhaust ports for a nice port job. Maybe patriot is working on a ported LSJ head sometime in the near future with better flow numbers.

    oh, and when this is finished/stickied a list of pros/cons to the swap would be sweet.
    once i get the head on and try some things I'm definetly doing this

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    Is the last journal on the exhaust cams the same as the intake? As in can you bolt the power steering pump to the exhaust cam? The reason I ask is this would allow you to use the PS block off plate from a cobalt or whatever to block the exhaust journal ..... it that doesn't work then I can make you a plate as long as you can take accurate measurements for me.

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    ok... Have you tried Bolting the LSJ head on your L61 Block Yet?

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    so just assuming, the LSJ head will flow better then the L61 head correct? ans as another asked will the head gaskets interchange

  11. Top | #23
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    A complete LSJ will bolt directly to an L61 with no modifications save for not being able to use the stock L61 thermoplastic intake manifold.

    Since the LSJ head doesnt flow any better stock than the L61 does there is really no point in using it unless you are boosted or plan on really going nuts porting. An L61 head with a spring and valve upgrade will still be the better choice for many people.

    Good writeup PJ, glad somebodyfinally got pics of this on the forum. Cant wait to see what you do with it.
    I know stuff about ECOTECS

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    Ok so with the lsj head. Why can't I use l61 cams in it? Take the block off plate the intake cam on the lsj and put it over the exhaust cam were the lsj gets the cam siganl from. This seems like it would work, if I had to fab up a block off plate still no big deal. Is there something I'm missing? I really don't want to have to spend another $500 on a set of cams.
    4 Cams + 32 Valves + 8 Cylinders + 5.0 Liters = .

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