MTBSully

iTrader: (7)

newbie ls question here but whatever. What is the difference between these motors. Obviously people drop them into f-bodies all the time, but what are the differences between each, and what parts are interchangeable? Also i see the 5.3L motor alot. What is this out of, and is it still technically an lsx? Thanks guys

TooLateVTEC

iTrader: (2)

The LQ9 is the higher compression 6.0 (10.0:1) out of a SS Silverado,escalade,VortecMax truck

The LQ4 is the lower compression 6.0 (9.0:1 I believe)

The 5.3 came in trucks,suburbans, and tahoes. Yes its still considered an LS motor.

http://en.wikipedia.org/wiki/GM_Vortec_engine

MTBSully

iTrader: (7)

cool. good to know

hcb1700

iTrader: (9)

A lot of people go with the 5.3 LM7 engine because you can find them for about $200 and they still make great power. I have one that I'm planning on dropping into my '78 Z28. LS1 and LS6 parts are interchangeable with the 5.3 liter engines.

MTBSully

iTrader: (7)

good info guys thanks

SixShooterCam

iTrader: (10)

where is a good place to get these motors at? junkyards? or are there special places to get them

tspence45

iTrader: (30)

They're also interchangable with the LQ4 and LQ9. I'm pretty sure the cranks are all the same, not sure about rods though. Only differences really are bore size, and the 5.3 and 6.0's are iron blocks instead of aluminum, like the LS motors. And the difference in the LQ4, and LQ9 are the pistons. LQ9's have the flat tops for higher compression, and the LQ4's have dished pistons to lower compression.