LQ9 vs LS2 bottom end

Reply Subscribe

Thread Tools

Search this Thread

Feb 22, 2011 | 07:58 AM

sman

Thread Starter

TECH Regular

iTrader: (4)

Joined: Sep 2007

Posts: 411

Likes: 0

LQ9 vs LS2 bottom end

Aside from the block and heads, are the lq9 and ls2 essentially the same? Same bore, same stroke, both have flat top pistons.

What if any are the differences?

Feb 22, 2011 | 08:08 PM

sman

Thread Starter

TECH Regular

iTrader: (4)

Joined: Sep 2007

Posts: 411

Likes: 0

No one.......

Feb 22, 2011 | 08:20 PM

Prorac1

10 Second Club

iTrader: (4)

Joined: Jan 2004

Posts: 1,069

Likes: 0

From: Martin Mi

Hey spencer. I dont know what the differances are, but I do know that the two rotating assys WILL interchange size wise. Thats all I got pal. Good luck. Eric L

Feb 22, 2011 | 08:22 PM

Prorac1

10 Second Club

iTrader: (4)

Joined: Jan 2004

Posts: 1,069

Likes: 0

From: Martin Mi

And IIRC it wasnt until the LS3 gen IV that they went to floating wrist pins. Eric L

Feb 22, 2011 | 09:13 PM

sman

Thread Starter

TECH Regular

iTrader: (4)

Joined: Sep 2007

Posts: 411

Likes: 0

Thanks! Guess I could have just thrown this up on mifbody.com huh? Lol

Feb 22, 2011 | 09:29 PM

NemeSS

TECH Senior Member

iTrader: (127)

Joined: Sep 2005

Posts: 6,889

Likes: 9

From: Houston,TX

Ls2 is gen4
Lq9 still gen3
Lq still has "distributor hole" cam reluctor sensor
Ls2 has reluctor cam sensor pickup on the timing gear sprocket. Later ls2 are 58x

Feb 22, 2011 | 10:00 PM

sman

Thread Starter

TECH Regular

iTrader: (4)

Joined: Sep 2007

Posts: 411

Likes: 0

I knew that stuff, was really just concerned with bore, stroke, and pistons dimensions.

What im really getting at is, does putting 243s on a lq9 ESSENTIALLY give you an iron ls2?

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Verdad Gallardo

6 Common C5 Corvette Failures and What's Involved In Repairing Them

Pouria Savadkouei

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Verdad Gallardo

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Pouria Savadkouei

Top 10 Most Powerful Chevy Trucks Ever Made!

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Verdad Gallardo

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Verdad Gallardo

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Verdad Gallardo

10 Camaros You Should Never Buy

10 LS Engine Myths That Refuse to Die

Verdad Gallardo

Feb 22, 2011 | 10:29 PM

sman

Thread Starter

TECH Regular

iTrader: (4)

Joined: Sep 2007

Posts: 411

Likes: 0

Exactly what I wanted to hear, picked up an lq9 this past weekend and getting 243s tomorrow after work.

With the TR224 and other mods in sig, what do you think it will put to the tires? 390?

Feb 22, 2011 | 11:18 PM

#10

ss454327

TECH Enthusiast

iTrader: (10)

Joined: Sep 2008

Posts: 619

Likes: 1

From: Scott, AR

Easy answer...yes. The differences were minute but around '05 the LQ9 started using the rotating assembly from the LS2...which was supposed to be stronger.

Feb 22, 2011 | 11:47 PM

#11

ovaboost

On The Tree

iTrader: (4)

Joined: Nov 2008

Posts: 158

Likes: 1

From: IOWA

It would be a heavy "LS2"

Feb 23, 2011 | 12:02 AM

#12

dug

Banned

iTrader: (10)

Joined: Aug 2002

Posts: 3,721

Likes: 0

From: Phoenix

wont the compression of a lq9 with 243 heads be higher than a ls2?

Feb 23, 2011 | 12:41 AM

#13

caddy03pimpin

Launching!

iTrader: (18)

Joined: Nov 2008

Posts: 296

Likes: 0

From: socal

The 05+ LQ9 has the same pistons, rings, rods, crank (minus the reluctor), timing chain/sprocket as a LS2.

Feb 23, 2011 | 12:56 AM

#14

Thefastguys

Staging Lane

Joined: Jan 2011

Posts: 73

Likes: 0

From: Michigan

the compression wouldnt be any different if you were using ls2 heads with a lq9 block.
its the same as an ls2 just about 100 pounds heavier i beleive.

Feb 23, 2011 | 06:11 AM

#15

outkast6991

TECH Fanatic

iTrader: (34)

Joined: Jun 2004

Posts: 1,625

Likes: 0

From: lancaster,pa

Quote:

Originally Posted by sman

Exactly what I wanted to hear, picked up an lq9 this past weekend and getting 243s tomorrow after work.

With the TR224 and other mods in sig, what do you think it will put to the tires? 390?

sounds about right i would think. torque should be up there as well

Feb 23, 2011 | 09:27 AM

#16

dug

Banned

iTrader: (10)

Joined: Aug 2002

Posts: 3,721

Likes: 0

From: Phoenix

whats the compression ratio of the ls2?

Feb 23, 2011 | 09:33 AM

#17

redtan

TECH Junkie

iTrader: (5)

Joined: May 2008

Posts: 3,764

Likes: 17

From: Belmont, MA

10.9 comp

Feb 26, 2011 | 10:06 PM

#18

94Conv

Teching In

iTrader: (2)

Joined: Dec 2010

Posts: 28

Likes: 0

From: Northern Indiana

I was told that the LS2 rods/pistons will stick out of the block .005 farther on the iron block, than on the AL... haven't checked it, but it would be worth checking if you are milling or using thinner head gaskets.