ou812sm

iTrader: (16)

how can you tell if your looking at an lq9 what marking are you looking for

ChevyTruck

iTrader: (39)

Look at the pistons, if they are dished then its a LQ4 if it has flat pistons then its a LQ9.

00ChevyScott

iTrader: (10)

Vin number or knowing what it came out of. Other than that you'd have to look at the piston tops.

BadAssChevy327

iTrader: (7)

ya and block should be iron and will have 6.0l stamped on it

GMC2500

Hey guys, I just want to make sure but I think I bought an LQ9 what was supposed to be an LQ4. I took the heads off and checked everything out and the motor supposedly came out of a 2006 and it's supposed to be an LQ4, the wreckers never told me the model though. I just assumed it was a regualr sierra, the weird thing is the pistons are not dished. Did they change the LQ4 piston in 06 or do I have an LQ9. Either way I'm happy. Any advice would be great thanks.

blsnelling

iTrader: (4)

AFAIK, all LQ4s have dished pistons, and all LQ9s have flat topped pistons. Does it have 6.0 cast into the back of the block?

GMC2500

Hey guys, I just want to make sure but I think I bought an LQ9 what was supposed to be an LQ4. I took the heads off and checked everything out and the motor supposedly came out of a 2006 and it's supposed to be an LQ4, the wreckers never told me the model though. I just assumed it was a regualr sierra, the weird thing is the pistons are not dished. Did they change the LQ4 piston in 06 or do I have an LQ9. Either way I'm happy. Any advice would be great thanks.

GMC2500

sorry my computer screwed up and replyed the same thing again,

It's definitley a 6.0 just wasn't sure about the piston situation

GMC2500

Now the other question is will it screw up my stock computer or will it run ok until I get a tune done in a couple months when I get some money

blsnelling

iTrader: (4)

The timing tables are certainly going to be different for the two, since the LQ9 has considerably higher compression.