Getting close to making a decision on blowers for my 10.0-1 tall deck 572’s with promaxx 317 heads flow 375 at 650 by Valeko, 254 264 .632 .632 112lc. Keeping compression where it is and switching to e85. Will probably set them up run 900-950hp for now but would like the ability to turn them up and run 1050-1100hp. I have read till I am blue in the face and have read about several marine engine builds that have achieved 1050hp on the carb whipple 3.3 and the 10-71. Which one is the right choice???

10-71 because of the E-85. 3.3s max around 900-1050. 10-71s dont generally make much more on pump piss, but on E-85 you could probably go 1200+

E85 is ethanol, not methanol, it is fine on aluminum. It may have water in the fuel issues more easily however.

E85 has had no effect on aluminum, stainless, rubber, or steel braided line that I have it soaking in for 3 years. There is a lot of mis conceptions about E out there. I have a guy on our river who has been running it for 10 years and does absolutely nothing different than if he was running gas. And has never had a single issue due to running it. He has a blown 25 Eliminator Daytona with aluminum tanks. He doesn’t even drain or treat the fuel in the fall. Just winterizes it and back it in the barn.

What drives are you going to run?

So you would say the 10-71 is capable of more power over the whipple when looking to max them out?

Even money on gas with a slight nod to the 10-71. 10-71 can probably make much more on ethanol.

One thing that will suck is range. You can make some inexpensive high octane gasoline by using 100LL and adding an octane booster with lead. You’d be getting better fuel economy in that scenario. But the ethanol is probably still makes more power on a blown app.