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Old 03-06-2008, 11:35 AM
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i have a iron 6.0 block and have read a lot about the different abbreviations like lq9 or something like that and i don't know the difference in all of them. my casting # is 12551364. any help would be appreciated.

thanks
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Old 03-06-2008, 11:49 AM
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i think its just the truck code for that block and ls2 is the aluminum code for the 6.0

there should be a sticky in the internal section for the ls2's
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Old 03-06-2008, 11:57 AM
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it is either a lq9 or lq4
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Old 03-06-2008, 11:59 AM
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lq9 has a higher compression ratio. 10 to 1
lq4 has the lower c/r 9.4 to 1
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Old 03-06-2008, 12:11 PM
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my heads are 317 castings. that is the 71cc chambers. i guess that would make it a lq4. is there any differences in the blocks?
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Old 03-06-2008, 12:28 PM
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some lq9 had 317 heads. they both have the same 71cc heads. the pistons are what is different for c/r.
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Old 03-06-2008, 12:41 PM
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piston # 9400978053
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Old 03-06-2008, 04:35 PM
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This will tell you all:

http://en.wikipedia.org/wiki/GM_Vortec_engine
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Old 03-06-2008, 05:20 PM
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thanks miller, my block says mexico on the back so i going to say it is a lq4.

chuck
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