LS Base GM Motors

[Nester6662]

Alright guys newbie here. I'm pretty knowledgable when it comes to gm SBC and BBC, but these new LS base motors I'm lost. So here's what I need from you guys. I'd like to know casting numbers and how to tell what motor I'm looking at? There's to many hustlers out here in Miami, and I'm on the the hunt for a few motors. I'm thinking of a small 6.0 for my shortbed that'll be my daily, and I really want to run a LS2 or better in my 67 Velle. And it seems everyones starting to get into these swaps, so I guess it's time I step my game up.

[Nester6662]

Nobody?

[CraiGM]

Are you implying people could sell you a GM V8 motor and lie that its a LS motor?

You should be able to tell them apart pretty easy based on the intake manifold alone...

[Nester6662]

No I'm talking about telling all the LS base motors apart. I know the diffrence between SBCs, BBCs, and LS base motors. That's not a problem at all. Example: How can you tell the diffrence between 5.3-6.0?

[CraiGM]

Well I hope this helps. Pulled from another forum.

Here is a list of a few casting #'s:
853 97-00 aluminum 5.7
241 01-03 aluminum 5.7
243 LS6 aluminum 5.7
852 and 706 99 and up 4.8-5.3 truck heads
873 99-00 LQ4 6.0 iron heads
317 01 and up LQ4 6.0 aluminum heads
035 02 and up LQ9 6.0 aluminum heads


Even more info:

Casting Number 241
Head: 1997+ LS1 5.7 Litre Passenger Car
Material: Aluminimum
Part Number:
12559853 (1997-98)
12559853 (1999-00) (not sure why same PN)
12564241 (2001-03)
Combustion Chamber Volume: 66.67cc
Compression Ratio: 10.1:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches


Casting Number 243
Head: 2001 LS6 5.7 Litre Passenger Car
Material: Aluminimum
Part Number:
12564243
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

Casting Number 706
Head: 1999+ LR4 4.8 Litre Truck
1999+ LM4 /LM7 5.3 Litre Truck
Material: Aluminimum
Part Number:
12559852
12561706
Combustion Chamber Volume: 61.15cc
Compression Ratio: 9.5:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 1.89 inches
Exhaust Valve Diameter: 1.55 inches

Casting Number 373
Head: 1999-2000 LQ4 6.0 Litre Truck
Material: Cast Iron
Part Number:
12561873
Combustion Chamber Volume: 71.06cc
Compression Ratio: 9.5:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

Casting Number 317
Head: 2001+ LQ4 6.0 Litre Truck
Material: Aluminimum
Part Number:
12572035
Combustion Chamber Volume: 71.06cc
Compression Ratio: 10:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches

[Nester6662]

Originally Posted by CraiGM

Well I hope this helps. Pulled from another forum.

Oh that's perfect thanks homie. Now I'm I correct all casting numbers are on the heads only? So the blocks can't tell you anything other than cast or alluminum.

[CraiGM]

Originally Posted by Nester6662

Oh that's perfect thanks homie. Now I'm I correct all casting numbers are on the heads only? So the blocks can't tell you anything other than cast or alluminum.

I thought the blocks were pretty much the same... Im not sure.

[Nester6662]

Originally Posted by CraiGM

I thought the blocks were pretty much the same... Im not sure.

Well thanks either way hopefully someone else cam answer that for me.

[A57]

all ls blocks are the same as in ls1 to ls3 are same blocks... different heads and cam.

truck blocks are castiron and use a bigger plastic intake...