Differences on most (if not all) flex fuel engines:

This isn't even considering the computing differences necessary to adjust timing, and knock sensing/reduction for different fuels, the multitude of fuel maps, etc.

Any retrofit kit isn't a true retrofit. It might make a car last a while with E85 in it'* system, and might run ok, but it'* not gonna be reliable, or super long lasting.

As mentioned E85 has a lower MPG due to lower potential energy...

There'* a few other things that we've found causing issues... best advice is to just avoid it if it wasn't built for it. A real biggie is the valve seat area (and valves, depending on specific program). Not sure how our iron heads will fare with E85 - they may be just fine, it may wreak havoc.

I'd bet on the wreak havok. Since alcohol is corrosive I wouldn't run it anything not designed for it, thats for sure.

I didn't wanna get too indepth on it, but yeah, there is more...

You wouldn't put diesel in a 3800, don't do E85...

Alright thanks. All very helpful information.