Date of manufacture, Cat 3406e

1mm is a 1999 engine.
It is also the last of the big bore E blocks. Its a 15.8 litre engine with a 575-600 hp rating. It was last of the E blocks but has the 70 pin ecm.
Same as a 2ws but only it was a 14.6 litre engine......

 

1lw - 14.6L 40 pin 1998
5ds- 15.8 L 40 pin 1998
Both E blocks
2ws 14.6 L 70 pin 1999
1mm 15.8 L 70pin 1999
Both E blocks.

6nz 14.6L 70 pin 2000
7cz 15.8 L 70 pin 2000
Both newwer sculptured blocks. C-15, C-16

Everybody rants and raves about the 6nz but my personal favorite is the 2ws.

 

A regular on here a few years back wasn't a big fan of the 6NZ either, he was from the Carolina's and would do engine work, also would buy nice trucks, clean them up and resell them with Youtube videos.
Can't remember his name but his posts were interesting.
Him and Mr Haney were always giving good advise, too bad they don't come on here anymore, i wonder why they decided to stop posting here.

 

I think your talking about robsredford.

Times have changed and I think they are just tired of all the B.S..

They did have great knowledge and advise to give.

 

2ws with 40 pin??
Someone doing some experimenting??

 

YOu ever decide to sell that motor let me know.

 

Yep. Mid '99.