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heads and cam

This is a discussion on heads and cam within the Internal Engine forums, part of the LSx Technical Help Section category; i feel a little out of place on this website, got directed from gm-trucks/forums.com was told you guys are "fuelie" ...

  1. #1
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    white
    2006 1500HD gmc sierra

    heads and cam

    i feel a little out of place on this website, got directed from gm-trucks/forums.com was told you guys are "fuelie" guru's. i have a 2006 1500HD gmc sierra with an LQ4, 4L80e, 14 bolt rear end. a few bolt ons ie K&N FIPK, magnaflow cat-back and a wicked tune done with EFI live. it goes pretty damn good, im sick of gettin wacked by my buddies diesel he barely beats me now. i found a set of LQ9 heads, completely re-worked for 800 bucks. what steps will i have to take installing these? what is a good cam with this short block/head combo? what kind of compression can i expect? cuz the lq4 and 9 are different top ends arent they? im tryin to get about 450hp out of this motor any other advice would be sweet thanks

  2. #2
    Member crossbredfoxbody's Avatar
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    white
    83 mustang coupe

    Get l33 5.3 heads or ls6 heads they are basically the same head. These heads with a good cam will make over 450 hp looking at 10.5 to 1 with l33 or ls6 heads

  3. #3
    Member importhater81's Avatar
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    black
    02 ss camaro

    Do you tow with your truck at all?I ask because if you do be careful what cam you choose.Some will make great power at the upper rpm range,but are dogs in the lower range,rendering truck useless for towing.

  4. #4
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    white
    2006 1500HD gmc sierra

    i can use the 5.3 heads? i can get a set of those too...i didnt know i could use those heads. i thought combustion chamber was too small for a 92mm bore...i thought the LQ9 heads were the best bet???

  5. #5
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    white
    2006 1500HD gmc sierra

    i want a good all-around cam. something daily driveable, tow-able and the odd givver at a light....

  6. #6
    Member crossbredfoxbody's Avatar
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    83 mustang coupe

    The only ls heads you would have any trouble with is l92 bc of intake difference and you Have to have a 4 inch bore for l92 heads. As far as stock heads go l92's are the best.

  7. #7
    Member crossbredfoxbody's Avatar
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    83 mustang coupe

    ls head casting numbers
    12556743...99......325..........Gen.III, 5.3L, aluminum, truck, van
    10215339...97......350..........Gen.III, LS1, aluminum, 68cc
    12558806...97-98...350..........Gen.III, "LS1", aluminum, 68cc
    12559895...00-up...325..........Gen.III, aluminum,
    12559853...99-up...350..........Gen.III, "LS1", aluminum, 68cc
    12559862...99-00................Gen.III, aluminum 4.8/5.3L
    12559895...00-up...325..........Gen.III, aluminum, Vortec 5.3L
    12561706...01-04................Gen.III, 5.3L, aluminum
    12562317...01-04...364..........Gen.III, 71cc, aluminum
    12564241...00-up...350..........Gen.III, "LS1", aluminum, 68cc
    12572035...01-04...364..........Gen.III, 6.0L, aluminum, 71cc
    #933 '97 perimeter bolt 5.7l
    Chambers = 69cc
    #806 '97-'98 perimeter bolt 5.7l
    Chambers = 69cc
    862 and 706 '99 and up 4.8-5.3l trucks
    Chambers = 61cc
    12564243...799 casting 01-up...350/364......Gen.III, "LS6", "LS2", aluminum
    Combustion Chamber Volume: 64.45cc
    Compression Ratio: 10.5:1
    Intake Port Volume: 210cc
    Exhaust Port Volume: 75cc
    Intake Valve Diameter: 2.00 inches
    Exhaust Valve Diameter: 1.55 inches
    Stock Head Flow Numbers
    Chamber 64.45 cc-------0.100---0.200--0.300--0.400---0.500---0.550---0.600
    Intake 210 cc----------------62------126----184----224-----251----256----257
    Exhaust 75 cc---------------57------108----143----163-----176----180----183
    ?L92 823, 716, 5364, 0821
    2.165 intake 1.590 exhaust 68.4 cc combustion chamber

    l92 equipped vehicles

    2007+ Cadillac Escalade
    2009+ Chevrolet Tahoe
    2007+ GMC Yukon Denali/Denali XL
    2007+ GMC Sierra Denali
    2008+ Hummer H2
    2009+ Chevrolet Silverado 1500

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