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Generation III Internal Engine 1997-2006 LS1 | LS6
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LQ4 or LQ9

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Old 04-23-2010, 11:33 PM
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Default LQ4 or LQ9
I have a 6.0L iron block out of a 01 chevy truck, got it dissasemabled, found out it has 317 heads but i cant for the life of me figure out if its a LQ4/LQ9. I called around but no luck, how can i tell?
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Old 04-24-2010, 12:32 AM
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If it has dished pistons it's an LQ4; LQ9's had flat tops and beefier rods for that year. Most likely it would be an LQ4 since it came out of a truck.
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Old 04-24-2010, 12:36 AM
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Im pretty sure when i took it all apart it had flattops in it but ill check again, thanks for the speedy reply.
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Old 04-24-2010, 12:38 AM
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Originally Posted by StrokerAce03
If it has dished pistons it's an LQ4; LQ9's had flat tops and beefier rods for that year. Most likely it would be an LQ4 since it came out of a truck.
Yep this is correct... look at the pistons, easiest way to tell!
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Old 04-24-2010, 06:54 AM
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Unless it was a Silverado SS or Escalade, its going to be an LQ4
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Old 04-24-2010, 10:05 AM
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There was no 01 LQ9. Production began with the 02 model year.
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Old 04-24-2010, 10:17 PM
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Originally Posted by GMCtrk
There was no 01 LQ9. Production began with the 02 model year.
Good to know thanks, can you tell me what the difference is in the two?
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Old 04-24-2010, 10:21 PM
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Originally Posted by 99beaSSt
Good to know thanks, can you tell me what the difference is in the two?
what are you talking about?
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Old 04-24-2010, 10:37 PM
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Originally Posted by bww3588
what are you talking about?
I know there both 6.0L and the pistons are different. Is there anything thing else that makes a LQ4 different from an LQ9?
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Old 04-24-2010, 11:17 PM
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Originally Posted by GMCtrk
There was no 01 LQ9. Production began with the 02 model year.
What he said! LQ9 was introducced in 2002 and put into Cadillac SUV/EXT, that year. They started to put them in Silverado SS in 2004.
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Old 04-24-2010, 11:27 PM
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There is also something about the length of the crank out of the back of the motor in some of the earlier lq4's. I can't remember what years so if somebody remembers please chime in.
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Old 04-25-2010, 12:26 PM
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Originally Posted by 87silverbullet
There is also something about the length of the crank out of the back of the motor in some of the earlier lq4's. I can't remember what years so if somebody remembers please chime in.
99 and 00 had a longer crank to mate up to the 4L80E transmission. in 01 they started using the shorter LS1 style crank with a spacer.
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Old 04-25-2010, 09:18 PM
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I just ordered a 6.0L crank from GM... the solid "truck" crank. I wonder if Ill have any issues bolting up my flexplate/converter.
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