ls6firebird

this might belong in another section, but the info im lookin for is for an engine swap on my truck. i want to put a 6.0 into my 90 silverado. its a 4x4, lifted and will be on 35s. i was wondering what the differences were between the lq4, lq9, and ls2. what are advantages/disadvantages of each of them? i wont be doing much to the motor, probly just long tubes, duals, and a mild cam. i know the trucks not a popular choice here haha, but if anyone has any tips, advice, or info, i would really appreciate it.

thanks

Bo185

Basically the LQ4 and LQ9 are the same, iron block, same heads. The LQ9 has flat tops hense more CR. I would do a LQ4 it'll run good on 87 gas plus is more common than the LQ9. The LQ9 and LS2 really need 92 gas or better to get the most out of them.

Plus the LS2 will have a premium being a AL block.

3pedals

iTrader: (3)

try the performance trucks link: www.performancetrucks.net/forums/

ls6firebird

thanks! is the lq4 the block they used in the heavy duty trucks?

Bo185

Yes, the LQ4 was used in the 2500/3500HD's and the Vans. The H2 Hummer also used it.


The LQ9 was used in the half-ton trucks. Caddy's/SS/Denali and VortecMax etc...

ls6firebird

ok yea i had a 1500hd which was the same setup as the 2500 non hd. thats probly what i'll go with then cause i was real happy with that motor

Bo185

I would run at least 4.56's with the 35's, especially with a 4l80.

bozzhawg

Make sure to tell em why the 92+

LQ4 9:6 comp
LQ9 10:1-10:2 comp
LS2 10:9 comp

LQ9 71-72cc head
LS2 64-65cc head

LQ4/LQ9 iron blocks
LS2 alum blocks

So as you can see we are just talking about the heads and pistons right now, there are a more differences, but it depends on your budget and intentions for which route to go...

Bo185

Yeah to lazy to post the CR info!


But the LQ9 has different rods as well, same length just the stronger ones. The LS2 has the same rods as the LQ9. The LQ4/9 have same heads "317's"/intake/injectors/ block/crank. Save for the early 99-00 LQ4 which had iron heads and thick crank flanges.

bozzhawg

Yeah, I was lazy right behind you bro, I stopped at heads and comp, back in the day I would write a thesis or manifesto on forums..... I think with our info combined it will be enough to get em started.....

ls6firebird

haha thanks guys...your info more than helped me out! for now anyway, i'll be knee deep when i get the project started

bozzhawg

Knee deep, holla back when you are like me neck deep..... lol

But like I said Boss, it depends on your budget..... Some guys do
the LQ4/LQ9 with the forged internals..... I had an forged motor before and for what I want to do, I decided to keep the hypo's this time, not spraying.... It worked for factory and guys are getting 100k+ out of em..... You might want to think of a cam/head,header,intake,TB etc swap........ I have never seen an all forged motor last 100K+ except for the 88-93 stangs and we know thier history, if they got 100k......

My thing was cost effectiveness..

You could find
a decent LQ9
cam, springs,headers, used heads 243's ported or L92's, 450-500HP easy

I looked for the 6.0's at the junkyards etc..... but I just found a good deal on a pullout a 06 GTO..... check out
car-parts.com

Thesis....lol

ls6firebird

haha yea its gonna get ugly. i'm gonna go with the lq4. i'll have the heads, intake, and tb done. throw in a mild cam and call it good. its no big project or anything, its gonna go in my dd. just cleanin up a little truck with 35s, nothin special. just thought it'd be cool to do somethin sorta different, and i miss my 03 6.0 chevy

bozzhawg

I was able to find Lq4's all day for like $800 to $1000

ls6firebird

wow that made my day. i was figurin it'd be a lot more'n that

bozzhawg

correction www.car-part.com

I found several in MO