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05 lq4 bottom end quesitons

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Old 12-06-2009, 03:34 PM
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Very good info 1Bear, thanks for posting it.
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Old 12-06-2009, 03:45 PM
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Originally Posted by 1Bear
Yes, the casting number for the LQ9 rods as identified on the side of the cap should be 123/145. The casting number for the 4.8L is 121BW & the 5.3L, 5.7L and the standard LQ4 6.0L used casting number 143. Typical weight of LQ9 rods are around 645 grams, while the standard rods typically weight around 609 grams.
Ok, I hope you are correct. Another very knowledgable member here stated that the beefier rods were not started in production into the 03 LQ9's which would have left me with the weaker LS1 style rod. Mine is an 02 LQ9. Just curious since I plan on pushing my LQ9 in the near future.
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Old 12-06-2009, 08:43 PM
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The LQ9 rods have always been stronger, beefier then the 4 rods. In 2005 ALL the 6.0's went to the ls2 rotating assem's. .
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Old 12-06-2009, 08:58 PM
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Originally Posted by Mangled03gmc
The LQ9 rods have always been stronger, beefier then the 4 rods. In 2005 ALL the 6.0's went to the ls2 rotating assem's. .
You're just repeating what you've read on here. I want official specs from GM.
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Old 12-07-2009, 11:27 AM
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Originally Posted by GMCtrk
Ok, I hope you are correct. Another very knowledgable member here stated that the beefier rods were not started in production into the 03 LQ9's which would have left me with the weaker LS1 style rod. Mine is an 02 LQ9. Just curious since I plan on pushing my LQ9 in the near future.
This is what I read here too...supposedly somewhere in 03 there was a production change (I have yet to get a chance to examine my 03 block to see what rods it has...). I was told to look for casting numbers on the rods, and if I see 123 or 145, they're LQ9 rods...
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Old 12-07-2009, 01:37 PM
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Originally Posted by GMCtrk
You're just repeating what you've read on here. I want official specs from GM.
Umm no I am certainly not repeating it.. I looked into this before I BOUGHT A 05 LQ4 so that i knew what I was getting.. 05 up is def the ls2 internals..
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Old 12-07-2009, 02:44 PM
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Originally Posted by Mangled03gmc
Umm no I am certainly not repeating it.. I looked into this before I BOUGHT A 05 LQ4 so that i knew what I was getting.. 05 up is def the ls2 internals..
We're not talking about lq4s bimbo. Re-read the thread
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Old 12-07-2009, 02:55 PM
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The rods are stronger you ****.. The title to the thread reads 05 LQ4
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Old 12-07-2009, 03:04 PM
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How do you know the 02 lq9 has them? According to 1fastbrick it started in 03
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Old 12-07-2009, 03:28 PM
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Originally Posted by GMCtrk
How do you know the 02 lq9 has them? According to 1fastbrick it started in 03
Well according to GM all the LQ9's have them, but like everything thing, you need to take what they say with a grain of salt. My truck is listed as having a 4L80E in the sales literature, but we all know regular ½ ton’s never got an 80. I'm sure some overzealous person putting the literature together assumed it had an 80 as all other trucks equipped with a 6.0L in 2001 had one.

Bottom line is if you don't trust what the documentation say's, you’re going to have to pull the pan and look for yourself.
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