50kta

lookin to put one in a 1980 t/a i just started finding a very little about the lQ9 can someone direct me to somewhere i can find out a bunch of info about the lQ9 i.e. what it came in and what years do i want? and anything else would be great! and can i use the computer and harness out of the truck ,for high performance like reflash it?

Gen3Benz

iTrader: (4)

I always liked the wikipedia list of gm vortec engines.
It will tell you what it came in....
List of Vortec engines
LQ9's have flat top pistons with a 10:1 compression ratio, i think everything else is the same as the LQ4

flywheel

iTrader: (2)

Do a search for lq9 lots of posts about them...That's what I did...

Basically came in 3/4 ton/bigger trucks/vans/suv's. Some of the trks are actually lq4's. Which is the same with alittle less compression. mine came from an 03 2500HD van. You can use the computer/harness check w/ speartech for all that stuff. They are a sponsor here on ls1tech. Lots of info here on this site...

Rick

9540x

Perhaps a little premature but check out www.car-part.com . It searches a plethora of junkyards across the U.S. You can find some great deals on engines on there with a little bit of effort.
As far as info goes, definitely keep up with this website and I've found that wikipedia is indeed a helpful and (usually) reliable source.

philntx

iTrader: (8)

From the "W"

The Vortec HO 6000 or VortecMAX, technically the LQ9, is a special high-output version of the Vortec 6000 V8 truck engine originally designed for Cadillac. This engine was introduced in other truck lines as VortecMAX for 2006. It features high-compression (10:1) flat-top pistons for an extra 10 hp and 10 ft·lb, bringing output to 345 hp (257 kW) and 380 ft·lb (515 N·m). LQ9s are built only in Romulus, Michigan.

LQ9 Applications:

2002-2006 Cadillac Escalade
2002-2006 Cadillac Escalade EXT
2003-2006 Cadillac Escalade ESV
2003-2007 Chevrolet Silverado SS
2004-2005 Chevrolet Silverado and GMC Sierra Vortec HO Edition Only [Badging on truck]
2006-2007 Chevrolet Silverado and GMC Sierra VortecMAX Option


LQ4
The Vortec 6000, or LQ4, is a V8 truck engine. It is a bored version of the Vortec 5300. Displacement is 6.0 L (364 in³) from 101.6 mm bore and 92 mm stroke. It is an iron/aluminum (note that 2000 model year engines had cast iron heads) design and produces 300-325 hp (224-242 kW) and 360-370 ft·lb (488-502 N·m). LQ4s are built in Romulus, Michigan and Silao, Mexico.

LQ4 applications:

Chevrolet Express/GMC Savana
Chevrolet Silverado 2500 Pickup, 3500 Pickup, Crew Cab, and Chassis Cab/GMC Sierra 2500 HD Pickup and Crew Cab, C3, Denali, and 3500 Pickup and Chassis Cab, 1500HD Crew Cab
Chevrolet Suburban/GMC Yukon XL Denali
Hummer H2 SUT
GMC Yukon Denali

itspossible01

iTrader: (4)

h......

50kta

thats all well and good but if im lookin at one on the ground how would i identify it lq4/lq9 WITHOUT lookin at the piston, i.e serial # or code#

philntx

iTrader: (8)

Since the blocks are the same and the heads are interchangeable, (unless someone knows something that I don't), the only way is to look at the pistons.

From Memory:
Compression is the only difference. LQ4 is 9.4; LQ9 is 10.1

The 01-04 LQ4's use the same cam as the 02-03 LQ9
The oil pans and front accessories are the same.

If it's a 6 liter with Iron heads, it's an 99-2000 LQ4

If it has a cable throttle body, it's probably an LQ4

Don't know much else, sorry.