Generation IV Internal Engine 2005-2014 LS2 | LS3 | LS7 | L92 | LS9

Understanding my engine, help.

Old Jul 25, 2020 | 08:49 AM
  #1  
AnnivSS's Avatar
Thread Starter
TECH Enthusiast
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2009
Posts: 591
Likes: 238
From: Lewisville, TX
Default Understanding my engine, help.

Good Morning all. So it seems I am finding a bit of conflicting information on the interwebs but it seems as if the aluminum 5.3L I pulled from my parents wrecked 05 GMC Envoy Denali (VIN M) is an LH6. However everything I can find says that should be an AFM engine. That vehicle for 100% fact did not have AFM. I did find a few blurbs (nothing Id take as a statement of fact) that they "had" AFM in 05 but it wasn't wired up. Am I still going to need an AFM delete kit for this engine?
Reply
Old Jul 25, 2020 | 09:22 AM
  #2  
Bspeck82's Avatar
TECH Fanatic
5 Year Member
Photogenic
Photoriffic
Liked
 
Joined: Jan 2017
Posts: 1,758
Likes: 442
Default

https://media.gm.com/dam/Media/docum...2005Envoy.html
Reply
Old Jul 25, 2020 | 09:45 AM
  #3  
AnnivSS's Avatar
Thread Starter
TECH Enthusiast
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2009
Posts: 591
Likes: 238
From: Lewisville, TX
Default


Ok so the short wheelbase models did not have AFM. Awesome. Thank you.
Reply
Old Jul 25, 2020 | 10:59 AM
  #4  
G Atsma's Avatar
TECH Senior Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2016
Posts: 22,303
Likes: 3,619
From: Central Cal.
Default

It wasn't activated on the SWB models. All LH6's had the capability. So you still might need the DOD delete kit.
Reply
Old Jul 25, 2020 | 11:26 AM
  #5  
AnnivSS's Avatar
Thread Starter
TECH Enthusiast
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2009
Posts: 591
Likes: 238
From: Lewisville, TX
Default

Originally Posted by G Atsma
It wasn't activated on the SWB models. All LH6's had the capability. So you still might need the DOD delete kit.

So I suppose at this point the only way to be sure if to pop the valve covers off and check to see if it has the 4 oddball rockers?
Reply
Old Jul 25, 2020 | 12:20 PM
  #6  
G Atsma's Avatar
TECH Senior Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2016
Posts: 22,303
Likes: 3,619
From: Central Cal.
Default

Rockers are all the same. 2 different lifters on AFM/DOD engines.
Reply
Old Jul 25, 2020 | 01:10 PM
  #7  
64post's Avatar
TECH Fanatic
Photogenic
Liked
Loved
Community Favorite
iTrader: (5)
 
Joined: Nov 2011
Posts: 1,710
Likes: 228
From: Sonoma Co. Ca.
Default

Originally Posted by AnnivSS
Good Morning all. So it seems I am finding a bit of conflicting information on the interwebs but it seems as if the aluminum 5.3L I pulled from my parents wrecked 05 GMC Envoy Denali (VIN M) is an LH6. However everything I can find says that should be an AFM engine. That vehicle for 100% fact did not have AFM. I did find a few blurbs (nothing Id take as a statement of fact) that they "had" AFM in 05 but it wasn't wired up. Am I still going to need an AFM delete kit for this engine?
If it has a valve body for a Valley cover or oil towers in the valley that are drilled, you probably need some kind of delete.
Reply
Old Jul 25, 2020 | 01:16 PM
  #8  
AnnivSS's Avatar
Thread Starter
TECH Enthusiast
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2009
Posts: 591
Likes: 238
From: Lewisville, TX
Default

Originally Posted by 64post
If it has a valve body for a Valley cover or oil towers in the valley that are drilled, you probably need some kind of delete.

I havent removed the valley cover yet but I seem to remember the top side of it looking the same as the one I pulled off my LM7.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-1

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-2

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-3

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

 Verdad Gallardo
story-4

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

 Pouria Savadkouei
story-5

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

 Verdad Gallardo
story-6

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-7

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-8

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-9

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

 Verdad Gallardo
Old Aug 1, 2020 | 11:33 PM
  #9  
64post's Avatar
TECH Fanatic
Photogenic
Liked
Loved
Community Favorite
iTrader: (5)
 
Joined: Nov 2011
Posts: 1,710
Likes: 228
From: Sonoma Co. Ca.
Default

Originally Posted by AnnivSS
I havent removed the valley cover yet but I seem to remember the top side of it looking the same as the one I pulled off my LM7.
You would know by looking at the top of the Valley cover, it’s not smooth but looks like a transmission valve body.
Reply


Thread Tools
Search this Thread

All times are GMT -5. The time now is 06:00 AM.

story-0
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-1
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-2
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-3
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-4
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-5
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-6
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-7
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-8
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-9
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE