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Engine Change For Crew-cabs

MS3DALE

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MS3DALE Senior Enthusiast

MS3DALE

Posted
Posted

Hey guys this was is in our DealerWorld news today,It only mentions GMC's but my guess is that Chevrolet is going to be the same.....

 

 

"Sierra 1500 4WD Crew Cab Engine Change Reminder......As communicated via a Distribution Newsletter earlier this month, beginning November 15th, the usage of 5.3 liter engines for model TK10543 & 1SA / 3SA / 3SB or 4SA will go -----------FROM-------(LH6) Aluminum Block 5.3 liter engine ------TO--------- (LY5) Iron Block 5.3 liter engine.

The (LC9) E85 Flex Fuel 5.3 liter engine will continue to be an option.

No order changes for orders in production are anticipated thus what you originally ordered will be built as ordered.

Orders produced with (LY5) will contain an aluminum spare rim whereas orders built with (LH6 or LC9) will receive a steel spare rim."

MS3DALE Senior Enthusiast

MS3DALE

Posted
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No,Haven't heard why the change. Maybe a shortage on aluminum :rolleyes:

Seriously though I have no idea,I just thought it was an interesting change.

At least it clears up who gets what spare wheel if they get the 5.3 (aluminum or steel)

But I've still seen 6-liter equipped trucks with both (Mine has an aluminum spare wheel)

Zembonez Senior Enthusiast

Zembonez

Posted
Posted
Aluminum cost more than the steel. More savings for GM

Might just be the case. I bet the production facility costs are higher for the aluminum block as well. GM is known for bean counter cost cuts... Makes sense.

 

Oh well... GM has a LOT of experience in the cast iron block manufacturing world. They have made some pretty darn good ones!

NathanL Enthusiast

NathanL

Posted
Posted

I don't know how much weight difference there was between the iron and aluminum block but I wish I had gone with the aluminum tho I don't think it's an option on the Ext Cab.

 

By the time you hang a winch mount and winch bumper on the front the new trucks sag A LOT. In the past I had always run a front end replacement on my 1/2 ton trucks with a winch with no problems. On my new one I had to take off the front end as it cause the truck to sag too much even with the front leveling kit.

 

Any less weight on the front would have been helpful - assuming it was noticable.

pm26 Senior Enthusiast

pm26

Posted
Posted

Aluminum is almost 3X lighter than cast iron. The specific gravity of aluminum is 2.7 and that of cast iron is about 7.0.

CalixEros Enthusiast

CalixEros

Posted
Posted

More of a deletion than a change. Both are gen IV LS engines, one just has an iron block. In '07, they were both used for Silverados... The flex fuel also had an iron or aluminum block. So 5 different versions of the 5.3 were offered on the '07:

5.3 gen III on the classic (LM7)

5.3 Al (LH6)

5.3 iron (LY5)

5.3 Al flex fuel (LC9)

5.3 iron flex fuel (LMG)

98 Z71 SLT Senior Enthusiast

98 Z71 SLT

Posted
Posted

5.3 T V8 classic iron block alloy heads

 

5.3 B V8 L-33 all alloy block/heads-classic

 

5.3 Z V8 iron block flex fuel-classic

 

These are all "classic" OBS engines...

MS3DALE Senior Enthusiast

MS3DALE

Posted
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I believe all engines have aluminum heads. Is that correct?

Yep,They all have aluminum heads.

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