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Duramax 6600 Welcome to the Internet's first Duramax 6600 diesel discussion forum for the LB7, LLY, LBZ, LMM, LML, LGH & L5P RPO code engines. Tips on performance, fuel economy, troubleshooting and more.

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Old 03-22-2010, 08:41 PM
DDiesel DDiesel is offline
Join Date: Mar 2010
Posts: 17
Question LBZ Clarification?

Is there anything more/less desirable to the LLY equipped '06s than the LBZs? I am looking to update from my '02 LB7 to an '06 or '07. Should I search only for LBZ equipped trucks or is any '06 model approachable? Also, is there a fuel economy poll posted for the LBZ engines? I didn't see one like the one for the LB7s. Very interesting info!
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Old 03-23-2010, 10:03 AM
Kennedy Kennedy is offline
Long Distance Crew Chief for BMDMAX
Join Date: Mar 2000
Location: Loyal WI US
Posts: 10,691

In my opinion, the 06 trucks are the same and retaining the LLY monicker is one of the stupidest things that GM could do. It just creates confusion. The only real difference is the ECM programming and while the HP rating remained at 310HP, the real world showed it more like 340HP or slightly above 50% of the difference between teh true LLY and the LBZ. When properly tuned they all run the same so no loss.
Kennedy Diesel-owner
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