Generation IV Internal Engine - LQ9 are the same as LS2 pistons?



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Mike Cordero
03-09-2012, 01:54 PM
LQ9 and LS2 pistons are the same? Same compression? Can be interchanged? Have a LQ4 and would like to increase CR.

LS1MCSS
03-10-2012, 03:27 PM
If you have an LQ9 it should already have flat top pistons, so the LS2 pistons wouldn't help a bit. If your pistons are dished, then the motor is an LQ4.
Prorac1
03-10-2012, 03:37 PM
Another option is to change to some cylinder heads with smaller combustion chambers. Eric L

Mike Cordero
03-11-2012, 03:57 PM
I just have the 6.0L block. It came as a LQ4 but don't have the pistons anymore so I'm interested in A LQ9, which increase the compression, but then I would like if someone offers me a set of pistons from a LS2, if are the same? Rods are the same too?
06X6spdGTO
03-11-2012, 04:30 PM
Need to have a 2005 or newer LQ4 otherwise the rods are different, and will not accept LS2/LQ9 pistons
Prorac1
03-16-2012, 12:41 PM
Need to have a 2005 or newer LQ4 otherwise the rods are different, and will not accept LS2/LQ9 pistons

Yeah, the newer motors have floating pins, the older ones are pressed. And from what I have seen the newer rods are quite a bit beefier. Eric L
Mike Cordero
03-16-2012, 02:49 PM
Yeah, the newer motors have floating pins, the older ones are pressed. And from what I have seen the newer rods are quite a bit beefier. Eric L

Thanks. Need a set of LQ9 rods and pistons, anyone????
Mike Cordero
03-19-2012, 09:26 AM
Yeah, the newer motors have floating pins, the older ones are pressed. And from what I have seen the newer rods are quite a bit beefier. Eric L

Do one is better than others, pressed Vs.full floating?
TurboS10
03-19-2012, 01:25 PM
with the beefier rod, the crank balance would be different on the 2005 up unless they changed the piston weight a corresponding amount.....
Mike Cordero
03-19-2012, 03:00 PM
with the beefier rod, the crank balance would be different on the 2005 up unless they changed the piston weight a corresponding amount.....

So which one would you look for, the pressed one or the full floating?
Prorac1
03-19-2012, 03:05 PM
I myself would opt for the floating pins. Eric L
93Z2871805
03-20-2012, 12:38 AM
Keep in mind LS2 had 3 different ring packs depending on the year the piston was made.
Mike Cordero
03-20-2012, 06:41 AM
Keep in mind LS2 had 3 different ring packs depending on the year the piston was made.

I have a 6.0L block from a LQ4. I don't have any pistons/rods at this moment, so I have to buy a set, so I was wondering which one is better. Can I use the LQ4 crank with LQ9 pistons/rods set ?
Specialized
03-23-2012, 12:18 PM
There is a set of LS2 pistons on ebay right now for 169.00 or 210.00 Buy-IT-Now

I purchased one of these sets to put into my LQ4. I am going to have my pins pressed onto my current rods to hang on the ls2 pistons.
godlyxdan
03-23-2012, 12:27 PM
I have a 6.0L block from a LQ4. I don't have any pistons/rods at this moment, so I have to buy a set, so I was wondering which one is better. Can I use the LQ4 crank with LQ9 pistons/rods set ?

yes you can, its a common swap because of the bump in compression