heads and cam

[chevyboy86]

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

[crossbredfoxbody]

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

[importhater81]

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.

[chevyboy86]

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???

[chevyboy86]

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

[crossbredfoxbody]

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.

[crossbredfoxbody]

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