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L92 HEADS l76 intake on LS1?

This is a discussion on L92 HEADS l76 intake on LS1? within the Internal Engine forums, part of the LSx Technical Help Section category; Ive seen L92 heads and L76 intake work with a Ls2. But will it work with my LS1? I eventually ...

  1. #1
    LS1-TA schrysler's Avatar
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    L92 HEADS l76 intake on LS1?

    Ive seen L92 heads and L76 intake work with a Ls2. But will it work with my LS1? I eventually want to go to an LSX block. Will this work or is it just wishfull thinking. I know the intake and heads will work well together but just dont know if it will fit on the block. If it will, how good do you think the set up is. On ebay I can get them both for about $1,100.00 plus shipping sounds like a good deal but will it work?
    1998 Trans Am Vert, M6, Soon to be full of goodies......

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    CAM mmmmmm... Toes's Avatar
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    nope...

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    LS1-TA schrysler's Avatar
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    why?

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    Senior Member mrr23's Avatar
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    yeah tell me why as well. after all ,the LS1, LS2 and LS6 are the same except the LS2 has a larger bore.

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    Firebird Encyclopedia 9T8W66's Avatar
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    You need a minimum of a 4" bore to use those heads.
    6.0 or bigger only. It sucks but thats the truth.
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    Senior Member mrr23's Avatar
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    again, why? there are plenty of people using 6.0L heads on LS1 engines. need to be more specific.

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    Mrs.'s Boobies
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    Because the larger valves (and angles) of the L92 will smack the cylinder walls of bores smaller then 4.00". Those heads are designed to work with 4.06" bores ideally. Typical 6.0L (LQ4, LQ9) heads have smaller valve then the L92, I believe they are the same size as LS1 valve sizes ... hence why LQ4 and LQ9 heads work on bores smaller then 4.00". The LS2 uses 243 (LS6) heads.
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    The L92 Heads have different valve spacing and bigger valves.They also use an offset rocker arm but I'm don't remember which one off the top of my head.
    They won't work on the smaller 3.90 bore of an LS1.The old Gen III heads have all the same valve spacing and work on 4.8's 5.3's 5.7's and 6.0's
    When they designed the new Heads GM new they could increase valvespacing and therefore put larger valves to increase airflow, This was because they were going to 6.0 and larger displacments in the trucks
    The L92 heads are similar to early prototype LS7 heads but it is still a truck head that's why it's so cheap.

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    LS1-TA schrysler's Avatar
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    Is there anything out there for the LS1 that would compare to those heads and intake for the price?

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    used and abused at wot ibanez7's Avatar
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    as stated above you need a 4" bore minimum.

    blocks to bore
    ls1, ls6

    blocks it bolts too
    6liter iron block -great block low cost
    ls2
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    the fast 90mm intake with a machined ported ls1 heads w/upgraded valvtrain is close to cost to the l92/l76 combo, just alittle more pricey!

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    Senior Member mrr23's Avatar
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    yeah, i got the answers today at PRI. the intake valve is 2.150". this will hit the cylinder on a 3.900 bore. i'll have some pics up shortly.

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    Member z28misfit's Avatar
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    Just pick up a copy of the new GMhigtech magazine. It will tell you what you want to know.
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    car enthusiast djvaly's Avatar
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    what is the gain due L92 heads on 402 ls2 forged block?
    I am swapping ls1 to ls2 402 stroker, so if I were to use L92 rather than Patriot stage III would I be better off? I know L92 are cheaper but what about the gain.. 30-40rwhp? or what>?
    Last edited by djvaly; 01-15-2007 at 07:44 PM.

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    I would say they are deffinately worth the switch over. The ports are designed better than an LS1 head, even ported ones as far as I understand. If you want to make sure you deffinately have a better head, I believe Livernois Motorsports offers a cnc'd version of the L92 head now. Not 100% sure but check their website out.

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    car enthusiast djvaly's Avatar
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    Quote Originally Posted by z28misfit View Post
    I would say they are deffinately worth the switch over. The ports are designed better than an LS1 head, even ported ones as far as I understand. If you want to make sure you deffinately have a better head, I believe Livernois Motorsports offers a cnc'd version of the L92 head now. Not 100% sure but check their website out.
    cool man, I'll do that research.

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    L92 Heads / L76 Intake

    I dropped off my L92 heads at the shop on Sat. He's going to mill them .030 to make the chambers 65cc, clean up the bowls and exhaust ports.

    The L92 heads and the L76 intake (90mm throttle body) cost me $1380.00 delivered. I spent another $500.00 on springs, rockers, stands and bolts. The head work will cost about $650-700.

    I expect to get about 500rwhp and 500 rwt with the above heads, a custom cam and a SLP 402.

    Should be very interesting.

    Bob K.

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    car enthusiast djvaly's Avatar
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    Quote Originally Posted by Bob K View Post
    I dropped off my L92 heads at the shop on Sat. He's going to mill them .030 to make the chambers 65cc, clean up the bowls and exhaust ports.

    The L92 heads and the L76 intake (90mm throttle body) cost me $1380.00 delivered. I spent another $500.00 on springs, rockers, stands and bolts. The head work will cost about $650-700.

    I expect to get about 500rwhp and 500 rwt with the above heads, a custom cam and a SLP 402.

    Should be very interesting.

    Bob K.
    I am getting 402 stroker block, G5X3 cam custom grind, and some good Patriot stage III heads or L92 modified like u (put the heads on a little later due to stock tranny still that can't handle over 450rwhp) and the mechanic said 490-500rwhp tuned..
    yes.. that's cool, make sure u have the 12 bolt rear end, and decent suspension work done (shocks, SFC) too.

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    Quote Originally Posted by schrysler View Post
    Is there anything out there for the LS1 that would compare to those heads and intake for the price?
    In aword no. These heads are great as they come. The cam requirements for them are SO much different than any of the ls1/2 stuff though. I would personally not even consider a cam with less than 12-14 degrees worth of split.

  19. #19
    Member z28misfit's Avatar
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    Yeah I would imagine with those heads you can run a pretty healthy cam with excellent power. I believe in GMHPT, they said around 700hp naturally aspirated with the right parts should be no problem with the L92 heads and the right intake of course! Don't qoute me on this though, just going by memory.

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    JOSEY FUCKING WALES! Frankthetank's Avatar
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    NO they are so cheap because they are mass produced because they are going on all the trucks

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