What differences are there between these model years?

 

I heard the 04 LS6 will have floating wrist pins.....

 

What advantages do the floating wrist pins have?

 

I have noticed a couple minor ones.
The cam bearings have a larger OD. This effects nothing until you need to change the bearings.
All the head bolts are the same length. The 4 short ones now fit all 20 holes.
The thermostat is different. The t-stat cover is also changed as is the machining on the housing. These parts will not interchange.
Thats all I really noticed.
Kurt

 

Also:
The water pumps are different. There is an electrical connector attached to the passenger side-head vent fitting. The timing chain is upgraded.

The story I heard is that Chevy implimented some of the LS2 upgrades though the 04 model year.

Steve

 

Any other changes I'd like to know,I have a 04 crate motor.

 

ttttttttt I coudn't resist,can't wait to get this motor in my car.