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LS Engines...which fit?

This is a discussion on LS Engines...which fit? within the General Help forums, part of the LSx Technical Help Section category; I was talking cars with a guy at work and I happened to mention the new LS3 (the one that ...

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    Sold: LS1 '85 El Camino ls1camino's Avatar
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    LS Engines...which fit?

    I was talking cars with a guy at work and I happened to mention the new LS3 (the one that is in the ZR1, right?). Well, he asked if I would ever put that or an LS7 in my Trans Am and it got me thinking...do all of the LSx motors fit in my car?

    I know the LS1 and LS2 do without any problems (direct bolt in), but what about the LS3 and LS7?

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    Senior Member mrr23's Avatar
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    the motors will bolt right in. PCM and harness changing for the LS3 and LS7 are in order.

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    Quote Originally Posted by mrr23 View Post
    the motors will bolt right in. PCM and harness changing for the LS3 and LS7 are in order.
    The stock LS1 can't be tuned for the engine?

    btw...I'm mostly trying to figure out what engine I want to attach the TT Kit to

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    Senior Member mrr23's Avatar
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    the LS1, LS6 have the cam and knock sensors in the same location. the LS2 moved them. you can get a harness adapter for those. the LS3 and LS7 have a different reluctor ring on the crankshaft 52x instead of 36x. so the PCM will misinterpret the crank signal and not start.

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    Quote Originally Posted by mrr23 View Post
    the LS1, LS6 have the cam and knock sensors in the same location. the LS2 moved them. you can get a harness adapter for those. the LS3 and LS7 have a different reluctor ring on the crankshaft 52x instead of 36x. so the PCM will misinterpret the crank signal and not start.
    So the LS1/2/6 have a 36x reluctor ring? I thought it had a 24X

    Cause Texas Speed sells the LS3/7 with either 24 or 58, neither will work with the LS1 computer?

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    Member Benner's Avatar
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    All the same size. And by the way it's not an LS3 in the ZR1. It's an LS9. LS3 is in the standard c6 now.

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    Quote Originally Posted by Benner View Post
    All the same size. And by the way it's not an LS3 in the ZR1. It's an LS9. LS3 is in the standard c6 now.
    LS9 is basically an LS3 to the extent that....you can make an LS3 into an LS9. i believe.

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    Quote Originally Posted by Benner View Post
    All the same size.
    On the outside, correct? (takes up the same amount of space)

    Quote Originally Posted by Benner View Post
    And by the way it's not an LS3 in the ZR1. It's an LS9. LS3 is in the standard c6 now.
    Thanks for the correction

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    Member Benner's Avatar
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    Yeah essentially the LS3 is the same as the LS9. I believe the compression is different and other little differences.

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    Doesnt the LS7 run a dry sump system?

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    Quote Originally Posted by Benner View Post
    Yeah essentially the LS3 is the same as the LS9. I believe the compression is different and other little differences.
    There are quite a bit of the LS9 components that are different then the LS3's to hold up the the Boost.
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    Member Benner's Avatar
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    Quote Originally Posted by bigrondownhiller View Post
    Doesnt the LS7 run a dry sump system?
    Correct and so does the LS9. LS3 still uses a wet sump system.

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    Senior Member mrr23's Avatar
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    Quote Originally Posted by ls1camino View Post
    So the LS1/2/6 have a 36x reluctor ring? I thought it had a 24X

    Cause Texas Speed sells the LS3/7 with either 24 or 58, neither will work with the LS1 computer?
    i was incorrect. it is 24x. brain fart.

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    Quote Originally Posted by bigrondownhiller View Post
    Doesnt the LS7 run a dry sump system?
    Can it be converted to a wet system if the crank is a wet system crank?

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    I dont know.

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