2ws or 6nz

I have a 2WS in my 2000 Star and its was only rated for 475hp although now its flashed to a 7CZ. I ran it stock for a long time and it would keep up or outpull all our 550s. Not sure why theres a big fuss over the 6NZ. If anything I would think the 2WS would be better since its a older serial number so maybe the nox files aren't as bad in them as the 6NZs... not positive on that but makes sense

 

problem is when I flashed to a 7CZ at the same time I also got 59 injectors and the marine camshaft. So with all that stuff it made a huge difference but I got no idea on just a 600 file flash. Im sure some people should be able to give u some insight.

 

Outside of the way the engine is sealed against oil leaks there isn't much mechanical difference between the two. Both have LOW NOX files in them and a 550 is a 550.........now why the one truck ran better than the others is that it was old enough that someone may have changed fuel codes in it before CAT cracked down on the dealers for doing this.

 

are the 2ws engines known for oil leaks? i have some oil residue # the valve cover,top of oil pan and base of head.i've always heard drivers say that cats leak.

 

From a noob...

What's the difference between the 6nz and the MBN...why the reason for the ECM swap? Reason being is I'm going to look at an '03 379 with a 475hp MBN motor.

 

I had a 2ws also which it ran pretty good but I reflash it to a 7cz here recently and to be honest I'm pretty impress with it so far. Mine is pretty much stock and I can see difference but I'm working making some other up grades.

 

Thanks wish-bone: Please keep us up to date on your projects...

 

so if i have a 2ws and a 6nz,i need to flash them to a 7cz file?