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Iron block LQ4 vs. LS2

This is a discussion on Iron block LQ4 vs. LS2 within the Internal Engine forums, part of the LSx Technical Help Section category; I recently picked up a '99 2500 HD pick-up. It had 350,000 miles! ran and drove with original driveline, this ...

  1. #1
    Member Jay37's Avatar
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    Iron block LQ4 vs. LS2

    I recently picked up a '99 2500 HD pick-up. It had 350,000 miles! ran and drove with original driveline, this truck had a very hard life, yet the engine still looks great. Very impressed. Has anybody out there ran the LQ4 in a perfomance app? How expensive does the gen3 LQ4 to Gen4 LS2 swap get with computer and sensor changes? The reason I ask is because I would like to build the 6.6 LQ4 then swap out short blocks with the LS2 to avoid having the car laid up for who nows how long. I paid 500 for the HD truck got a LQ4, 4l80, and 350 back in scrap weight. It seems impossible to find a good deal on a LS2 block?
    Thanks in advance for any help
    Last edited by Jay37; 11-26-2010 at 03:47 PM.

  2. #2
    Veteran Blackbird WS6's Avatar
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    if im not mistaken Ron aka HI-PO is running the LQ4...not 100% sure

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    Sold: LS1 '85 El Camino ls1camino's Avatar
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    2000 Grand Prix GTP
    2000 Trans Am WS6 M6

    The difference between the Gen III and Gen IV motors are as follows:

    - Valley Cover...LS6 style with the PCV in the cover. Other changes include the Oil Pressure Sensor being integrated into the cover just like the PCV. The thing here is that the valley cover matches the Gen IV block, so an LS1 or LS6 Valley Cover should be used in your application.
    - Knock Sensors...these were moved from the Valley Cover to the side of the block. Because you'll be keeping the Gen III Valley Cover, you don't have to worry about this.
    - Timing Cover...camshaft sensor was moved from the rear of the engine to the front. You'll also need the electrical extension.
    - Cam Timing Gear...has provision for the camshaft sensor being moved to the front.

    Everything else should swap right over.

  4. #4
    Member Jay37's Avatar
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    Thanks!

    More questions,

    Do all of the LS2s have a 58x reluctor wheel? If they do what would need to be done to get the factory computer to work with the gen3s 24x wheel? I am assuming that knock sensors would operate on the same frequency?

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    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
    98' trans am

    there are conversion kits to run a gen III to a gen IV

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    Sold: LS1 '85 El Camino ls1camino's Avatar
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    2000 Grand Prix GTP
    2000 Trans Am WS6 M6

    Quote Originally Posted by Jay37 View Post
    Thanks!

    More questions,

    Do all of the LS2s have a 58x reluctor wheel? If they do what would need to be done to get the factory computer to work with the gen3s 24x wheel? I am assuming that knock sensors would operate on the same frequency?
    I THINK there is an electrical converter out there that will plug in between the sensor and the computer...if not, you'll need to get the correct reluctor wheel pressed onto your new crank.

    Quote Originally Posted by shady milkman View Post
    there are conversion kits to run a gen III to a gen IV
    It sounds like he wants to put the LQ4 into his GTO which has a Gen IV LS2, so he already has the parts, he just wants to know what he needs to swap it over.

    Taking that into consideration, you won't need the extension for the cam sensor.

  7. #7
    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
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    Quote Originally Posted by ls1camino View Post
    I THINK there is an electrical converter out there that will plug in between the sensor and the computer...if not, you'll need to get the correct reluctor wheel pressed onto your new crank.



    It sounds like he wants to put the LQ4 into his GTO which has a Gen IV LS2, so he already has the parts, he just wants to know what he needs to swap it over.

    Taking that into consideration, you won't need the extension for the cam sensor.
    good call.

  8. #8
    Member Jay37's Avatar
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    I talked to performance wiring. according to them, all the gtos have a 24x wheel.
    Last edited by Jay37; 11-26-2010 at 03:48 PM.

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