nitr0racing21

iTrader: (5)

Hopefully someone can answer this question for me and others who are wanting to know can hopefully search and find this thread

NemeSS

iTrader: (127)

99-07 was running years for lq4
99-00 had cast iron heads and thick crank flange.
were avaialable in 2500 silverados, and sierra pick up trucks.
also available in 2500 cargo vans.

john.s

iTrader: (6)

basically any of the 2500 series gas vehicles came with an LQ4... SS trucks, Denali's and Escalades came with LQ9's... (if im not mistaken)

nitr0racing21

iTrader: (5)

Also when going to see the motor in person what are the differences between the LQ4 and LQ9?

NemeSS

iTrader: (127)

cant tell them apart of both have 317 heads.
need to remove plugs and "feel" top of piston with a pencil and see if it "dips"
which means its dish piston lq4.
if pencil runs across smooth, it is a flat top piston and a lq9

custm2500

iTrader: (11)

Yes the "luxury" truck Denali and Cadillacs had the lq9 rated at 320hp I do believe. The LQ4 is in the everyday trucks.

shtnfrds

iTrader: (1)

there wer also a number of 1500HD 2wd that got the LQ4.

Chris05

The LQ9 was rated at 345hp and 380 ft lbs of torque

JAX04

iTrader: (17)

ok, so im quite and idiot when it comes to these new motors and what not, so the lq4 is a 6.0 correct? and also, how well do they took boost in there stock form?

sorry for being and idiot with the lq.. motors

NemeSS

iTrader: (127)

yes 6.0 and stock lq4 will handle 500+rw with proper tune, sufficient fuel supply and even more with upgraded rod bolts and valve springs.

JAX04

iTrader: (17)

would you say its a better for boost motor in stock form then the ls1 and ls2

NemeSS

iTrader: (127)

yup, will handle more psi stock, make better power with less psi, heads flow better than ls1, but same as ls2 but with larger chamber. scr is 9.4:1 stock
easily take 10+psi with proper tune and injectors.

JAX04

iTrader: (17)

sweet, i was going to buy a motor this winter from the local pick a part and was looking for a good direction for a low to moderate boost motor. then next summer or fall start forging

nitr0racing21

iTrader: (5)

Here is some info on what I know LQ9'sare good for nitrous because of the flat top piston and the LQ4's are good to boost due to there pistons beening "dished"

In stock form a LQ4 can handle 12 PSI but most people wont go that high of boost so people go with 9-10 PSI


I plan to get a LQ4 from a local place then boost it in the spring. I have a 100 shot right now and I want to do boost + spray but I am unsure what kinda work I will need to do I want 10 PSI plus a 10 shot or maybe a 15 shot.any advice

JAX04

iTrader: (17)

that is amazing, i am running a 100 shot right now as well, this is exactly the plan for me as well.

i wonder if i can control the lq4 with the ls1 computer? and if my built 4l60e i have lieing here will bolt to it as well? i dont mean to hijack your thread boss, it just seemed like the right thread for us both to get answers as we are on the same page

nitr0racing21

iTrader: (5)

I already have them answer yes the LS1 PCM will control the LQ4 and yes it will bolt up

JAX04

iTrader: (17)

You= da man!!

JAX04

iTrader: (17)

ok, so basically, i pull the one out and drop the new one in? with fluids and all that jazz, but while its out, i might as well upgrade the rod bolts and springs while im at it. cool.

i guess i just need to find one now, and come up with a genius way to make more room under the hood of the gto?

also, lq4 motors in the trucks, did they come with the 4l80 trans? ifso i guess ill do some research and see what it takes to get that put in the goat as well, cuz if im not mistaken its a bit sturdier then the 4l60e and i may be able to sell the 4l60 for some extra cash

oldsracer

Subscribed for details because these are exactly the questions I had and the build Im going to be doing