GM LH6 Engine

Slow Joe · 01-30-2010, 05:18 PM

Is the 5.3L (LH6) any good?

We're looking at an SUV that has one, and I'm just curious if it has any issues or what not...

Elaborate...

wrath · 01-30-2010, 05:27 PM

Gen IV 5.3L in aluminum format with AFM, usually found in the GMT360 platform (Trailblazer, Envoy, Rainier, 9-7x, et cetera).

Nothing to get too terribly excited about, other than it's better than a Trailvoy with an I6.

What are you looking at?

Slow Joe · 01-30-2010, 05:53 PM

A GM SUV with one in it...

Just curious about issues/qwerks...

Nothing too serious...

GTO RLY? · 02-03-2010, 11:51 AM

Should be pretty similar to the LS platform in terms of reliability and build quality. Maybe a little valvetrain tick, but it shouldn't be too excessive. Unless it's been abused heavily, you won't be disappointed.

Windsors 03 Cobra · 02-03-2010, 01:25 PM

I do not know a whole lot about this problem but I can tell you I have 2 low mile 62k and 53k 6.0 litre Chevy V8's here and they are using a quart of coolant every 1000 miles.
I'm sure the 5.3 and 6.0 are real close cousins in their engine family.
I thought they were good motors, I see them making good power and lasting long I just dont understand why this has happened even with good coolant changes.

Blame a vendor I guess.
Subject:Information on Gradual Coolant Loss Over Time with No Evidence of Leak Found #06-06-01-019B - (06/12/2007)
Models:2004-2006 Buick Rainier2001-2006 Cadillac Escalade Models2001-2006 Chevrolet Avalanche, Blazer, Silverado, Suburban, Tahoe, TrailBlazer Models2001-2006 GMC Envoy, Jimmy, Sierra, Yukon Models2001-2004 Oldsmobile Bravada2005-2006 Saab 9-7Xwith 4.8L or 5.3L VORTEC® GEN III, GEN IV V8 Engine (VINs V, T, M, B, Z -- RPOs LR4, LM7, LH6, L33, L59
This bulletin is being revised to include engine RPO L59. Please discard Corporate Bulletin Number 06-06-01-019A (Section 06 - Engine/Propulsion System).

Some vehicles may experience a gradual coolant loss over time. A very low percentage of cylinder head(s) manufactured with an embossed Castech logo may develop a porosity crack in a very specific area.

Inspect the cylinder head assembly to determine if the casting was manufactured by Castech. This can be accomplished by inspecting for their casting logo located on top of the intake port, under the rocker arm support rail and in the spring deck cavity portion of the cylinder head.

Flicktitty · 02-03-2010, 01:41 PM

fuckin saab's.

brotherbenn83 · 02-03-2010, 06:40 PM

cheap fix, throw some LSx heads on there...can be had cheap anywhere, like from my toolbox

Yooformula · 02-03-2010, 10:56 PM

well the 5.3l in my 03 Yukon is running damm well with no coolant loss with over 175k miles on it. I do plan on getting the dexcool out of it this spring though.

Brian98GTP · 02-04-2010, 09:38 AM

My Envoy runs the LH6. No problems at all with it. Good solid engine so far!

01-30-2010, 05:18 PM	#1
Slow Joe Saab vs The Police... Join Date: Dec 2004 Location: Oconomowoc, WI Posts: 5,864	GM LH6 Engine Is the 5.3L (LH6) any good? We're looking at an SUV that has one, and I'm just curious if it has any issues or what not... Elaborate... __________________ Thanks, Joe Reichard 2007 Saab 9-5 Aero 2004 Saab 9-3 ARC Convertible

01-30-2010, 05:27 PM	#2
wrath Grandpa Grocery Getter 2.0 Join Date: Dec 2007 Location: Waukesha, WI Posts: 1,559	Gen IV 5.3L in aluminum format with AFM, usually found in the GMT360 platform (Trailblazer, Envoy, Rainier, 9-7x, et cetera). Nothing to get too terribly excited about, other than it's better than a Trailvoy with an I6. What are you looking at? __________________ Buy made in the United States. Otherwise your job might be next. Unless you already wear black shoes and a visor with golden arches on it to work in which case your fellow american has already failed you.

01-30-2010, 05:53 PM	#3
Slow Joe Saab vs The Police... Join Date: Dec 2004 Location: Oconomowoc, WI Posts: 5,864	A GM SUV with one in it... Just curious about issues/qwerks... Nothing too serious... __________________ Thanks, Joe Reichard 2007 Saab 9-5 Aero 2004 Saab 9-3 ARC Convertible

02-03-2010, 11:51 AM	#4
GTO RLY? 5.0... It's what's for dinner. Join Date: Jan 2010 Location: With ze Germans Posts: 138	Should be pretty similar to the LS platform in terms of reliability and build quality. Maybe a little valvetrain tick, but it shouldn't be too excessive. Unless it's been abused heavily, you won't be disappointed. __________________ 05M6 CGM GTO - Svede OTRCAI, Bassani, minus 144lbs, self SD tuned with HPT2.23beta & LC-1

02-03-2010, 06:40 PM	#7
brotherbenn83 RIP Dad 4-29-08 Join Date: Dec 2007 Location: Muskego Posts: 632	cheap fix, throw some LSx heads on there...can be had cheap anywhere, like from my toolbox __________________ People SHOULDN'T be afraid of their government, governments should be afraid of their PEOPLE.

02-03-2010, 01:25 PM	#5
Windsors 03 Cobra Al Bundy Join Date: Mar 2007 Location: Racine Posts: 2,029	I do not know a whole lot about this problem but I can tell you I have 2 low mile 62k and 53k 6.0 litre Chevy V8's here and they are using a quart of coolant every 1000 miles. I'm sure the 5.3 and 6.0 are real close cousins in their engine family. I thought they were good motors, I see them making good power and lasting long I just dont understand why this has happened even with good coolant changes. Blame a vendor I guess. Subject:Information on Gradual Coolant Loss Over Time with No Evidence of Leak Found #06-06-01-019B - (06/12/2007) Models:2004-2006 Buick Rainier2001-2006 Cadillac Escalade Models2001-2006 Chevrolet Avalanche, Blazer, Silverado, Suburban, Tahoe, TrailBlazer Models2001-2006 GMC Envoy, Jimmy, Sierra, Yukon Models2001-2004 Oldsmobile Bravada2005-2006 Saab 9-7Xwith 4.8L or 5.3L VORTEC® GEN III, GEN IV V8 Engine (VINs V, T, M, B, Z -- RPOs LR4, LM7, LH6, L33, L59 This bulletin is being revised to include engine RPO L59. Please discard Corporate Bulletin Number 06-06-01-019A (Section 06 - Engine/Propulsion System). Some vehicles may experience a gradual coolant loss over time. A very low percentage of cylinder head(s) manufactured with an embossed Castech logo may develop a porosity crack in a very specific area. Inspect the cylinder head assembly to determine if the casting was manufactured by Castech. This can be accomplished by inspecting for their casting logo located on top of the intake port, under the rocker arm support rail and in the spring deck cavity portion of the cylinder head.

02-03-2010, 01:41 PM	#6
Flicktitty meh Join Date: Apr 2005 Location: Shotgun Posts: 9,068	fuckin saab's.

02-03-2010, 10:56 PM	#8
Yooformula Administrator Join Date: May 2002 Location: nw side Posts: 13,025	well the 5.3l in my 03 Yukon is running damm well with no coolant loss with over 175k miles on it. I do plan on getting the dexcool out of it this spring though.

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