I'm going with "theta".
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I'm going with "theta".
The 2004.5- 2006.5 model year Duramax 6600 is an LLY, and the vehicle will have a number 2 (number two) as the eighth digit of the VIN. Injectors and injector fuel return lines are outside the valve covers.
The 2006.5-2007 model year Duramax 6600 is an LBZ, and the vehicle will have a letter D as the eighth digit of the VIN. The LBZ virtually identical to the earlier LLY, and in-fact, the latest LLY engines are said to be the same as the LBZ, except for power/torque rating, ECM & programming and emissions certification.
Looks like we are rooting for a "D".
damn right im looking for the LBZ lol..i have been doing some research haha..i want an lbz crew cab (ccsb)with leather heated seats ohh and 4 wheel drive haha my buddy who works on and drives a dmax told me that with the lbz, if i put a fass fuel air sep. on it and a EFI Live tune she can push 500hp..i think that might be a little off but its still nott that bad. but if i cant find the truck i want for the price then i might just upgrade to the mondo and wait a little longer..whatever comes first haha
YUP............It's the CHIT!!
Running EFI LIVE DSP5 and the ADII instead of Fass. She scoots...................
Depends on emission testing and where you live but I deleted the cat too and did a 4in downpipe and 5in exhaust. I love hearing that turbo whistle :) cheers!
we took in a lbz crewmax 4x4 about 2 years ago on tradein, been mad ever since that i didnt grab it then, was low milage and clean