I have a '99 LS1 attached to a 4L60E Tranny in my garage. I was thinking of building it up (383 Forged Rotating Assembly, Ported Heads, etc.) in my garage and swapping it into my 2000 WS6 M6. I'll only be switcing the engines, not the Trannys.

I was wondering if there was any major difference between the '99 and '00 LS1s that I should be aware of before I attempt this endeavor.