Quote Originally Posted by 383 chev
I asked about this before but now the local rob shop (gas station) has e85 and someone on here before said that they just put it in and went, no hose replacement or anything. so a question that i havent asked yet since this is a diff. blend of fuel and will prolly burn differently will the spark plugs still read the same as if u were running gasoline i.e black = rich, white = lean. and is the fuel pressure still run at or near 6 to 7 psi?
Plugs on Alcohol engines are a bit harder to read for some reson. They seem to take longer to get a good color on them. I have an old Champion lighted plug viewer, sure helps the plug checking.

A couple sizes fatter on the jets, then some tweaking with the power valve size will be in order... Because of the higher octane you can get away with more compression and a bit more timing, but also you're going to give up a couple mpg....

I use an exhaust gas analyzer to evaluate jetting with E-85, mainly becuause it takes longer to get a color reading on the plugs.