'05 "T" and "Z" motor differences

[Boost]

Could someone please tell me the difference between a "T" motor in an '05 Silverado and a "Z" motor in an '05 Avalance? They are both 5.3 and I don't think either has VVT or DOD. Is one Flexfuel? What are the mechanical differences that would affect tuning? I asking because I flashed one of my "T" motor experiments into a "Z" and it runs GREAT, just wondering about the details. Thanks!

[Taz]

Both VIN "T" & "Z" are iron block 5.3 L Gen III engines. VIN "T" is the LM7 variant. VIN "Z" is the L59 Flex Fuel variant.


Regards,
Taz

[ChipsByAl]

The "Z" engine is flex fuel. It has larger injectors so it can run on E85. It also uses a flex fuel sensor to determine the ethanol content. A "T" engine file cal or full flashed in a vehicle with a "Z" engine would run quite rich.
Al

[Boost]

Thanks for the info! I am guessing its not running rich because I only flashed the script from stock to tune from the "T" engine onto the "Z" cal. Thoughts on this?