natural1

I own a 2004 Chevy 2500HD ECSB 4X4 with the 6.0L/4L80E. I realized that this thing gets horrible fuel mileage, and figured that it should at least be fast (I stumbled on to this site). I am having trouble finding information on the specs of the LS engines (ie. injectors, intakes, bore, stroke, rod length, rod/main journal, deck height etc.) from engine to engine. I can see already, that these are like the Ford, where parts are somewhat interchangable. What works and what doesn't? How strong are they? At what point do I need to build a motor? My expertise is in the field of DOHC/SOHC modular engine mustangs, so I know the tuning/electrical side of things. I just don't have the GM LS specifics down. Since I can weld, I am thinking of going with a single turbo, as I already have the turbo. Either a remote mount, requiring me to change the turbine housing, or under the hood. Will a Duramax intercooler fit or will I have to change the shroud and space the radiator? Remember this is a blank canvas, all things conisdered.

Great site guys!

XLR8NSS

iTrader: (4)

I'm moving this to GM engine and performance since it's mainly about engine specs and what not.

Oh, and WELCOME!!! Thanks for the props.

If no one has chimed in I'll answer some of the questions a little later, gotta run.

natural1

I spent this weekend trying to become a Gen III guru (seriously I have a Gen III bible on my desk). I was even able to save useful information for use later. Here is some you guys might/should already know.

INTERNALS

Bore:

4.8L: 3.78*
5.3L: 3.78*
5.7L: 3.90
6.0L: 4.00
7.0L: 4.125

*Cast iron blocks can be bored up to 3.910" (I've heard mixed opinions)

Stroke:

4.8L: 3.27
5.3L: 3.62
5.7L: 3.62
6.0L: 3.62
7.0L: 4.00

Bore Spacing:

All: 4.40

Deck Height:

All: 9.240

Rods:

4.8L: 6.275*
5.3L: 6.096
5.7L: 6.096
6.0L: 6.096
7.0L: 6.096**

*long rod
**titanium rods

CRANKSHAFT

Main Journal Dia:

All: 2.56

Rod Journal Dia:

All: 2.10

CYLINDER HEADS:

Interchange, Period. Though varing chamber volume, port volume, and valves may yield undesirable performance. I find the stock 6.0L heads to be very useful for my application for their LS6 like mid-lift flow numbers and larger chamber volume. The mid-lift flow numbers are more important to me as the engine operates in this range more often. (ie. in an intake or exhaust cycle the engine will see maximum lift only once.)

INTAKES:

Interchange, Period. Older LS1 intakes may hamper performance because of their smaller plenum and runner volume. 5.06L/0.536L (LS1) and 5.19L/0.541L (LS6). The information I have found states that the plenum volume is 4.0L/0.541L for the LQ4. Mabe? I am not sure how accurate all this is.

CONCLUSION:

1) The Gen III engines are quite strong. From what I got, many failures can be blamed on mechanic's error and not so much on mechanical error.

2) The Duramax intercoooler will fit and '05 electric fans will be installed.

3) Still sketching up turbo configuration. (leaning toward conventional setup.)

4) The Eaton "gov-bomb" is on the way out and a Eaton Posi will step in its place.

5) My blank canvas now looks like a color by number.

6) I answered my own post.

Gran Patron

That is very great info!!!! Bout' damn time the gov locker is being replaced with the Eaton.

natural1

Thanks for the props. Don't get too excited, I am replacing my own differential (GM is not changing the HD diff. line up).

Thought of the day:

The Gov-Lock blows dogs for quarters.