Compression ratio

I'm currently running 13:1 compression with my 408 on e85. The pistons are 5 thousands out of the hole with a 57cc Edelbrock head (ported). I also use Scat I-beams (great rod for the money). I have heard that you can go a little over 14:1 on e85...but I have no idea if you would have head gasket issues at that level (I'm using Felpro 1008's). My engine does seal up well with studs (also a good idea for high compression).

One thing you will need if you are going to run e85 is a wide-band O2 sensor. e85 burns so clean that it is VERY difficult to read plugs. The wide-band is about the only way to get a safe tune on the carb without guessing. I run my car between 0.77-0.82 lambda at WOT.

With that said, you can make pretty stupid power with the right setup....my Barracuda is running low 10's on e85 and can drive most anywhere...except past a gas station:D.