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Generation III Internal Engine 1997-2006 LS1 | LS6
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which engine do i have?

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Old 07-17-2018, 01:35 AM
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Default which engine do i have?
Is it an lq9? Its a 2006 2500hd
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Old 07-17-2018, 06:10 AM
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Probably LQ4.

LQ9 came in Escalade & Denali type vehicles.
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Old 07-17-2018, 08:11 AM
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Stick a bore scope in the spark plug hole. Flat top = LQ9, dish = LQ4.
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Old 07-17-2018, 10:14 AM
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Originally Posted by DustyNova442
Is it an lq9? Its a 2006 2500hd
Assuming that you're asking about a 6.0, it should be an LQ4. LQ9 motors came in hot rod pickups and required premium fuel. Work trucks and vans got LQ4's.

Like said above the flat top or dish piston will tell you which you have. Dish is LQ4 flat is LQ9
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Old 07-17-2018, 11:01 AM
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Dome is LQ4? That would increase compression over a flat. DISH would make it lower, which LQ4 is. Come on Pooter, you know this stuff! lol
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Old 07-17-2018, 12:50 PM
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If it's still in the truck or you know what truck it came from you can just check the rpo codes. Otherwise do what they said above and check the piston.
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Old 07-17-2018, 02:48 PM
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Originally Posted by G Atsma
Dome is LQ4? That would increase compression over a flat. DISH would make it lower, which LQ4 is. Come on Pooter, you know this stuff! lol
Oops, typing while drinking can be dangerous.
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Old 07-17-2018, 06:34 PM
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Uh-oh, officer, I believe I observed someone TUI... suppress him!!
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Old 07-18-2018, 10:01 AM
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like pooter said if its a 2500hd with a 6.0 it will be a Lq4 with 8th digit of the vin being a U
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Old 07-18-2018, 10:08 AM
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Originally Posted by RB04Av
Uh-oh, officer, I believe I observed someone TUI... suppress him!!
LOL stop resisting!
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