Jump to content


Photo
- - - - -

LQ4 and LQ9 Difference


  • Please log in to reply
21 replies to this topic

#1 ChevelleSS

ChevelleSS

    SS Newbie

  • Newbie
  • 10 posts

Posted 01 June 2003 - 04:15 PM

What is the diffence in the LQ4 and LQ9 engines?
I have heard that the LQ9 (H.O.) has a little more compression but is that the only difference in the two to gain the additional 45 hp?
  • 0

#2 Bear

Bear

    Senior SS Member

  • Member
  • PipPip
  • 273 posts
  • Gender:Male
  • Location:Jones Creek, TX.
  • Drivetrain:AWD

Posted 01 June 2003 - 05:56 PM

The LQ4 & LQ9 are very closely linked, the LQ9 has LS6 based heads with the same combustion chamber volume as the LQ4. The extra compression comes by different pistons. They use identical cam specs. as does even the base motor in the Vett. So we can see the extra hp came from more compression, slightly different heads "same port vollumes" & different programing in the computer.

Bear: 01"Pewter"C3 :flag:
  • 0
01 "Pewter" C
12.04 @ 110.38mph, 1.67 60ft. Maggie W/2.8
11.67 @ 117.49mph, 1.64 60ft. W/75hp Shot

#3 BigTex

BigTex

    *Elite SS Member*

  • Member
  • PipPipPipPip
  • 1,401 posts
  • Location:Dallas TX
  • Color:Black
  • Year:2003

Posted 01 June 2003 - 06:06 PM

Not quite correct.

Hypereutectic flat top pistons on the LQ9, cast dished pistons on the LQ4. Same heads on both motors. If you have an LQ9, look at the casting number - 317. Same as on the LQ4.

The stated HP numbers from GM are sort of a game anyway. Look at how they rate the LQ4 on the other platforms. They rate different HP on the Denali vs the trucks, but its the same physical motor. Same thing they did with the Z28 and Camaro SS. Same physical motor, one has a differnt air intake - instant 20 HP ratings.
  • 0
Richard -
2008 2WD Silverstone TBSS
Retired: 2003 Black SS - Radix - 12.3 @ 109

#4 Bear

Bear

    Senior SS Member

  • Member
  • PipPip
  • 273 posts
  • Gender:Male
  • Location:Jones Creek, TX.
  • Drivetrain:AWD

Posted 01 June 2003 - 06:25 PM

I'm not saying GM is perfect in any way as you possibly may have the wrong casting number on them but the LQ9 head part # is 12572035, casting identifiable as 035, the LQ4 head is part # 12562317 which you know is identifiable as 317. I would say the only way to know for sure is to find the whole part # which is located under the valve cover between the push rod holes. By the way I do agree with you about differece in pistons as said the two heads carry the same combustion chamber vollume.

Bear: 01:Pewter"C3
  • 0
01 "Pewter" C
12.04 @ 110.38mph, 1.67 60ft. Maggie W/2.8
11.67 @ 117.49mph, 1.64 60ft. W/75hp Shot

#5 BigTex

BigTex

    *Elite SS Member*

  • Member
  • PipPipPipPip
  • 1,401 posts
  • Location:Dallas TX
  • Color:Black
  • Year:2003

Posted 01 June 2003 - 10:42 PM

Bear, I hope you aren't getting your info from an article in the March (or Feb) issue of GM High Tech Performance magazine or the book "Chevy LS1/LS6 Performance", both by the same author- Chris Endres. I have some concerns about that source. I have yet to see an 035 head. I've looked on SSs and Escalades and have not seen one. My LQ9 has 317 heads.

Posted Image

Does anyone here have 035 heads on their SS?
  • 0
Richard -
2008 2WD Silverstone TBSS
Retired: 2003 Black SS - Radix - 12.3 @ 109

#6 Krambo

Krambo

    *Elite SS Member*

  • Moderator
  • PipPipPipPip
  • 6,055 posts
  • Gender:Male
  • Location:Bangor PA
  • Owns:SS
  • Color:Black
  • Year:2003
  • Drivetrain:AWD

Posted 03 June 2003 - 08:57 AM

Does anyone here have 035 heads on their SS?

317 here :chevy:
  • 0

Posted Image
For pictures and Modification info --->My Garage link My sprayed 408 build --->Project Black Widow
10.86 @ 128 1.7 60ft - 200 shot


#7 BenKey

BenKey

    Misinformation.....

  • Member
  • PipPipPipPip
  • 11,820 posts
  • Gender:Male
  • Location:White Plains, MD
  • Color:Arrival Blue
  • Year:2003

Posted 09 June 2003 - 06:16 PM

Also 317.
  • 0

'03 SS, 410ci Stroker


#8 mcwarren

mcwarren

    Senior SS Member

  • Supporting Member
  • PipPip
  • 312 posts
  • Gender:Male
  • Location:Show Low, AZ
  • Owns:SS
  • Color:Victory Red
  • Year:2003
  • Drivetrain:AWD

Posted 09 June 2003 - 10:59 PM

317 here also.
  • 0
Michael

2003 Victory Red Silverado SS, BedRug, Tinted Glass, Magnacharger Radix Supercharger, 2.9" pulley, Transgo shift kit, 160 stat, Gaylord's x-2000 SpeedSturr, Magnaflow cat-back. 13.3 @ 99.7 1.8 60'

My other ride: 2010 Harley-Davidson Dyna Super Glide Custom FXDC

#9 Daugherty

Daugherty

    SS Newbie

  • Member
  • 5 posts
  • Name:Will
  • Gender:Male
  • Location:Texas
  • Owns:SS
  • Color:Black
  • Year:2003
  • Drivetrain:AWD

Posted 11 May 2010 - 01:47 AM

317 here to
  • 0

#10 2BFAST

2BFAST

    kcocofodla

  • Member
  • PipPipPipPip
  • 3,719 posts
  • Gender:Male
  • Location:N.E Missouri
  • Owns:SS
  • Color:Black
  • Year:2005
  • Drivetrain:AWD

Posted 11 May 2010 - 07:34 AM

317 here to



Notice the date on this thread?? lol
  • 0
1969 Camaro - LS1 / 60E - Build Thread
1969 Camaro Z/28 - LSx 408 / 80E
2013 Silverado LTZ - Daily D
2005 Silverado SS - Blown & Sprayed - Build Thread - SOLD

------------------
- Go ZIPPY and send'em HOME !! -

#11 kcsilveradoss

kcsilveradoss

    Resident Ford Lover

  • Member
  • PipPipPipPip
  • 3,914 posts
  • Name:Shaun
  • Gender:Male
  • Location:Kansas City, MO
  • Owns:SS
  • Color:Victory Red
  • Year:2003
  • Drivetrain:AWD

Posted 11 May 2010 - 07:51 AM

My thread shovel has a 317 cast into it :jester:
  • 0
Posted Image

LINK TO MY GARAGE
http://www.silverado...h...tem&CID=278

JANUARY 2011 TRUCK OF THE MONTH

Go Zippy and send 'em home

visit my website: www.d.h.intxisafgt.com

#12 Bear

Bear

    Senior SS Member

  • Member
  • PipPip
  • 273 posts
  • Gender:Male
  • Location:Jones Creek, TX.
  • Drivetrain:AWD

Posted 11 May 2010 - 08:52 PM

Yep, proven time and time again.........LOL
  • 0
01 "Pewter" C
12.04 @ 110.38mph, 1.67 60ft. Maggie W/2.8
11.67 @ 117.49mph, 1.64 60ft. W/75hp Shot

#13 dragpny

dragpny

    SS Member

  • Member
  • Pip
  • 27 posts
  • Name:Jason
  • Gender:Male
  • Location:IOWA
  • Owns:SS
  • Color:Black
  • Year:2003
  • Drivetrain:AWD

Posted 02 January 2013 - 09:11 PM

Not to beat a dead horse but is that the difference between a N code and U code. N code LQ9/345hp U code LQ4 300hp. I triing to pick up a LQ 9 for my LS mustang swap and want to get the right one. Found an 05 caddy LQ9. Thanks.
  • 0
BBP tune, Airaid intake tube, Efan Conversion. Basic bolt ons.

#14 BLNAWAY

BLNAWAY

    *Elite SS Member*

  • Member
  • PipPipPipPip
  • 2,687 posts
  • Name:ALEX
  • Gender:Male
  • Location:IOWA
  • Owns:SS
  • Color:Victory Red
  • Year:2003
  • Drivetrain:AWD

Posted 02 January 2013 - 10:04 PM

Not to beat a dead horse but is that the difference between a N code and U code. N code LQ9/345hp U code LQ4 300hp. I triing to pick up a LQ 9 for my LS mustang swap and want to get the right one. Found an 05 caddy LQ9. Thanks.

this thread is 3yrs old FYI ....but from what I read above the difference is the pistons..... but I no expert on this just glanced thru seems to have same head,cam just different piston

Edited by BLNAWAY, 02 January 2013 - 10:07 PM.

  • 0
BLNAWAY-1_zpsc84ec58a.gif
**TUNED BY KELLEY PERFORMANCE**
14.687@92mph 2.170 60'

MY GARAGE: http://www.silverado...y-silverado-ss/
MY BUILD: http://www.silverado...-2003-na-build/

#15 canadianVRss

canadianVRss

    Yeeeah buddy!

  • Member
  • PipPipPipPip
  • 1,863 posts
  • Gender:Male
  • Location:Rochester Alberta
  • Owns:SS
  • Color:Victory Red
  • Year:2005
  • Drivetrain:AWD

Posted 02 January 2013 - 10:59 PM

connecting rods are beefier in the lq9 as well
  • 0
-2 12" 380watt RMS subs powered by a 600 RMS Sony amp-Custom sub box built by Paulguy -7" inch single din flip screen deck-styleline 2 inch cowl hood-BSER rollpan-Intimidator wing replica-OBX LT's, X-pipe, DI/DO flo pro muffler, 2 glass packs then dumped out the side-Doug's 2.5" E-cutouts -Zippy tuned-160* stat-TR6 plugs-AEM copy aluminum CAI-MSD plug wires and wire covers-L92 heads (dual patriot gold springs, patriot seals locks and comp 7.400" chromemoly pushrods)-L92 intake-LS3 90mm throttle body-torq rush 3.0 X-link-Fast 65lb injectors-224/228 .581 .588 114LSA comp cam-LS2 HD timing chain and gears-transgo HD2 shift kit with TCI billet 2nd and 4th servos-circle D 278mm single disk 3200-Tru-cool long trans cooler




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users