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L92 heads on in Silverado

This is a discussion on L92 heads on in Silverado within the GM Trucks forums, part of the Vehicle Specific category; I'm thinking of going with LS7 heads on my car. So I might want to use the L92 heads on ...

  1. #1
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    Onyx Black
    2001 WS6

    L92 heads on in Silverado

    I'm thinking of going with LS7 heads on my car. So I might want to use the L92 heads on my 03 Silverado HD. Not sure if my truck has the lq4 or lq9 but I do know it's one of them (sorry, haven't bothered to look). The Truck is my DD and very reliable. Not really looking to make the truck go faster or anything like that. No performance goals in mind. Just asking what the gains would be? If it's not enough information, I apologize and try to get some more as soon as I can.

  2. #2
    Member Nitrous's Avatar
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    White
    97 GMC with 02 LS6 engine

    Don't waste your time on an LQ4 unless you have it bored 4.00 or larger. Most L92 heads are installed on 6.0 or 6.2's and require the L76 intake with 39lb injectors. They would be nice if you have a 6.0 or 6.2. There's a good right up on them in GMHightechperformance and Carcraft magazine. You might be able to google the articles.

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    Onyx Black
    2001 WS6

    Thanks. Right now I got the L92/L76 installed in my car (mods in sig). I thought LQ4 did have a 4.00 inch bore so I could reuse the L92's on the Silverado when I go with LS7 heads in the T/A.

    2001 WS6: SDPC LS7 Shortblock, L92 heads upgraded for .600 lift,
    L76 intake, Nick Williams TB, Comp Cams 224/228 .581/.588 114+2 LSA
    Waiting for boost
    2003 Silverado 1500HD

  4. #4
    Member Nitrous's Avatar
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    97 GMC with 02 LS6 engine

    5.3 LM4 = Bore x Stroke: 3.78 x 3.62 Inches. Compression Ratio: 9.5:1

  5. #5
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    Onyx Black
    2001 WS6

    Finally remembered to look. 8th digit in VIN is U so I have an LQ4, right?

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    Member Nitrous's Avatar
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    97 GMC with 02 LS6 engine

    That should be a 4" bore.

  7. #7
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    2003 Silverado

    Quote Originally Posted by SlowBird01 View Post
    I'm thinking of going with LS7 heads on my car. So I might want to use the L92 heads on my 03 Silverado HD. Not sure if my truck has the lq4 or lq9 but I do know it's one of them (sorry, haven't bothered to look). The Truck is my DD and very reliable. Not really looking to make the truck go faster or anything like that. No performance goals in mind. Just asking what the gains would be? If it's not enough information, I apologize and try to get some more as soon as I can.
    You have a LQ4. Check the casting number on the corner of the head if it 317 it has the LQ9 heads on it. They put them on some 4s that year. I have a 2003 6.0l in my Silverado out of a 2500 it has the 317 heads on it.

  8. #8
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    1968 c-10

    Quote Originally Posted by Nitrous View Post
    That should be a 4" bore.
    yes 6.0 is 4.00 bore.

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