La1 to L67 question
 

would i need a bcm and pcm for my 2003 mc or just pcm? any tips and advice would be appreaciated just took out the old 3400

I was just talking to Will from Overkill, and I asked him the same thing. He said that all you need is the pcm. I was asking him about a 2003 Monte. Not sure what year yours is, but he said that with the 2003 pcm tuned for the L67, you don't need the bcm.

yup mine too 2003 3400 POS blew up 49k miles ;/ bout the kit from mike at milzymotorsports so just wana make sure i wont need the bcm

My 3400 still runs really well, but I want a 3800. So I'm picking up a Series III 3800 on Friday to swap into my car. Thinking about top swapping it before I put it in my car.

yea i just want a better engine model, i saw a ls4 swap somewhere on here and kind of regret already buying the 3800 sc

You'll need the PCM and you'll need to modify your wiring harness OR get the harness from an L67 powered Monte