OK - I am thinking on going to E85
What is the best CR for a 598 CI burning E85 - think I heard 14 to 1
Also I have Holley EFI - The FAST system uses a fuel sensor to sense what fuel is being run.
Can this same sensor be wired into the Holley EFI ?

Supercharged E85 works nice.

That was my other thought - Whipple and E85

With E85 do you still need to run an intercooler?

We do, 15 psi and E85 seems to work well.

we race a turbo LS on E85(last 6 years) no IC 25psi, 1500hp awesome stuff, we ck it at the pump before we buy, most of the time its about E87-89, and we dont buy in winter, they put more gas in to aid starting when cold. stuff does not want to start when cold, only neg I've seen

So IF I go natural aspirated what CR should I run?
They make a tool for testing the fuel.
What about the sensor that they use with the FAST system?

12-1

IF I was to go to a Whipple what size for a 598?
My engine was designed and built to install an M4 Procharger.
I know that that would be the best choice but they are BUTT UGLY
This same engine produced 1425 HP on Dave Wesseldyke's dyno with the M4.
I have enough room to install the intercooler under the engine and IF I could install the M4 as low as possible and run the pipe up the back of the engine that goes to the carb hat I might be able to do that.
I like the looks of the Whipple but I will be going sequential port EFI.

My other thought was to talk to Tom Airhart and go to a turbo charger system.