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LQ4/LQ9 engines...

This is a discussion on LQ4/LQ9 engines... within the Internal Engine forums, part of the LSx Technical Help Section category; Ok guys. I'm new to this motors and I have no clue bout intervals either. I need some help from ...

  1. #1
    Senior Member 98maro's Avatar
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    LQ4/LQ9 engines...

    Ok guys. I'm new to this motors and I have no clue bout intervals either.
    I need some help from you.

    A while ago I posted a thread asking some feedback on 383/402 stroker kit.
    I did some research and the 383 was good for my
    Needs.
    The kits are kinda expensive. Almost $2000 for just the kit
    Plus new/used block ls1/6

    Now I want lq4/lq9 motor for my ss.
    I heard those can make some nice numbers with ported heads,LTs, nice cam, ms3 ms4 maybe?

    My questions.
    Do I have to do any modifications to make them fit on my car?
    Do I have to run bigger injectors for that motor or I can use the stock ones on the ls1?
    How are the stock heads on this motors?
    Porting them should be ok?
    I knw I have to get the car tunned for that. But do I need new PCM wires since it's a different motor or I can use all I have in my car right now?

    I forgot to add. I'll be getting an ls6 intake too

    Thanks for the help.. I hope this is not to hard to read lol

  2. #2
    cutting and welding mark21742's Avatar
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    They are practically the block other than bore and being iron....all you really have to do is drill and tap a hole on the front of the lq4/9 for the alternator bracket.

    Everything can swap right over from the ls1 block except the pistons of course. But when it comes to the injectors it mainly depends on your particular fuel needs with your can choice.

    Also going to a larger displacement motor a large cam will be much more tame than in the stock 346.

    Your computer will work fine, just need a tune.

    Hope I helped!

  3. #3
    cutting and welding mark21742's Avatar
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    hugger orange
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    They are practically the block other than bore and being iron....all you really have to do is drill and tap a hole on the front of the lq4/9 for the alternator bracket.

    Everything can swap right over from the ls1 block except the pistons of course. But when it comes to the injectors it mainly depends on your particular fuel needs with your can choice.

    Also going to a larger displacement motor a large cam will be much more tame than in the stock 346.

    Your computer will work fine, just need a tune.

    Hope I helped!

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    Junior Member adrian73069's Avatar
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    white
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    recently bought a car with iron block which im still wondering if its a lq4 or 9 since guy tht sold it didnt know much but yea still have most ls1 parts so far just rocker arms heard he had to change em a few times, i have a post up where im figuring stuff out but got a vid up on there

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    Senior Member 98maro's Avatar
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    thanks for the replies..

    so everithing will work right/? stock motor mounts, accessories and stuff like that..
    i will def get a tune for that..

    so what ill do just buy a stock motor,
    get the ls6 intake
    ls2 chain
    ls6 oil pump
    get the LTs
    ms3 or ms4 cam. not sure yet..

    how abou the stock heads? just port them or get some ls6 ported heads?
    00 ss blk m6 " STOCK" strano springs, slp bilstein shocks, adj LCA, adj panhard bar, relocation brackets, 2 point SFCs welded,OEM zo6 rims black, magnaflow exhaust, CME exhaust,E/cutout, slp grille, custom front plate mount, HIDs, whistler mod, side moldings delete, slp air lid, ported and polished TB, strut tower brace, 3.73s gears, and some other parts to list!
    next to come,4.10s,ls7 clutch, ms3 or 228r cam, ported 243s, ls6 intake, ls6 oil pump. ls2 timing chain, longtube headers no cats, with a tune..
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    dbl clutch'n like i shld WICKEDLS1's Avatar
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    im doing the same thing you are 98 but im going with an lq9. i have a few friends that have done them and they say there fairly simple installs with minor modifications. only difference is im going with a boosted set up so my build will be a little different then yours

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    Senior Member 98maro's Avatar
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    Quote Originally Posted by WICKEDLS1 View Post
    im doing the same thing you are 98 but im going with an lq9. i have a few friends that have done them and they say there fairly simple installs with minor modifications. only difference is im going with a boosted set up so my build will be a little different then yours
    nice bro.. what parts you got so far?

    what are the differencxes on lq4 and lq9.. ?
    lq4 is the newer engine or im wrong..

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    Veteran Blackbird WS6's Avatar
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    Quote Originally Posted by 98maro View Post
    what are the differencxes on lq4 and lq9.. ?
    lq4 is the newer engine or im wrong..
    4- low compression ratio

    9- high compression ratio

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    Senior Member 98maro's Avatar
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    Quote Originally Posted by Blackbird-WS6 View Post
    4- low compression ratio

    9- high compression ratio
    so im guessing lq9 is better right?

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    Quote Originally Posted by 98maro View Post
    so im guessing lq9 is better right?
    for n/a yes.... this will change with the CC of heads you use as well

    if your going with boost your going to want low

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    Senior Member 98maro's Avatar
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    Black
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    i probably do a turbo in the future, probably not...

    what heads could be good choice?

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    Senior Member 98maro's Avatar
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    a friend of mine called saying he has a lq9 or lq4 block im not sure.
    it complete has around 80k miles.
    he wants $600 is that a good price?

  13. #13
    Veteran Blackbird WS6's Avatar
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    Quote Originally Posted by 98maro View Post
    a friend of mine called saying he has a lq9 or lq4 block im not sure.
    it complete has around 80k miles.
    he wants $600 is that a good price?
    it is a runner??

  14. #14
    Senior Member 98maro's Avatar
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    Quote Originally Posted by Blackbird-WS6 View Post
    it is a runner??
    he said it was running when they pulled it out..
    its been sitting there for a year or more.

    he has like 4 or more.. 6.0s 5.3s

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    Quote Originally Posted by 98maro View Post
    he said it was running when they pulled it out..
    its been sitting there for a year or more.

    he has like 4 or more.. 6.0s 5.3s
    well if it was me, i would get one of them (6.0L), for the best price you can and just do a stock bottom end rebuild and throw on the cam and heads you want with a good intake and call it done

    again thats just me, im sure others have there take on the matter

    and if your wanting a stroker then thats going to cost some more bc youel need the insides lol

  16. #16
    Senior Member 98maro's Avatar
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    Quote Originally Posted by Blackbird-WS6 View Post
    well if it was me, i would get one of them (6.0L), for the best price you can and just do a stock bottom end rebuild and throw on the cam and heads you want with a good intake and call it done

    again thats just me, im sure others have there take on the matter

    and if your wanting a stroker then thats going to cost some more bc youel need the insides lol
    lol.. yeah thats why i dont want the stroker kit no more.. i just to much money to spend,

    thats my idea get a 6.0 bottom end stock just get a nice cam port the heads and all the bolt ons and get it done..

    i dont need to get new kit harness for that block right or i need it?

  17. #17
    cutting and welding mark21742's Avatar
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    Quote Originally Posted by 98maro View Post
    lol.. yeah thats why i dont want the stroker kit no more.. i just to much money to spend,

    thats my idea get a 6.0 bottom end stock just get a nice cam port the heads and all the bolt ons and get it done..

    i dont need to get new kit harness for that block right or i need it?
    nope, bolts right in and hooks right up other than the alt hole in the front of the block that needs drilled and tapped

  18. #18
    cutting and welding mark21742's Avatar
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    Quote Originally Posted by 98maro View Post
    lol.. yeah thats why i dont want the stroker kit no more.. i just to much money to spend,

    thats my idea get a 6.0 bottom end stock just get a nice cam port the heads and all the bolt ons and get it done..

    i dont need to get new kit harness for that block right or i need it?
    nope, bolts right in and hooks right up other than the alt hole in the front of the block that needs drilled and tapped

  19. #19
    cutting and welding mark21742's Avatar
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    If you can, pull a head. Lq4 has dashed pistons, lq9 has flat top pistons

  20. #20
    Senior Member 98maro's Avatar
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    Black
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    I appreiate the help. Thanks.

    Aother thing. Now that I'm Getting another motor.
    I want to relocate the alternator. This motors have them on the top. Is there any way I can keep it on that location?
    Or I could have some cleareance issues?

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