Originally Posted by InnerAirLock
How can you tell what motor you have lq4 or lq9?
All I know it's out of GMC 2500 2002 LS5.3
not sure if it's an RPO code that would listed with the vehicle, but I knew it was a 6.0l out of a 2500hd. the lq4 is usually in the 2500hd and the lq9 is usually in the escalade.
I'm sure there's a simple way to find out, but I'm not sure if there's markings on the motor to designate that. should be a sticker on one of the heads that you could run the # at a dealer.
you could use a borescope and see if the piston is flat top or dished (or pull a plug). or do you have the vin#?
that's all I got