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« on: January 07, 2022, 09:32:30 PM »
I built a 390 for my 67 Mustang two winters ago using parts I had on hand and ended up with about an 11.75 to 1 motor so I decided to try running pump e85 as kind of an experiment. It's been more or less satisfactory on the whole. 26I used a Carter high volume mechanical pump, and converted a 735 "U" carb I had which being vacume secondaries gave some problems on the dyno, but once sorted out gave almost identical numbers to the motor with a 750 dyno carb and race gas, 490 hp and 500 tq. My fuel tank is stock, all the lines are steel or braided Aeroquip. I used a replaceable element fuel filter. How it works.....It runs fine, maybe a little hard starting. Corrosion has been minimal. A very small amount in the carb, maybe a little more in the fuel filter housing, ( which is aluminum ). The motor will still ping at lower rpms under load, so I have a 10 degree retard switched in the MSD, and run that a lot of the time when cruising and such, ( giving me 26 degrees ). I think the inconsistency of the pump e85 has something to do with this. And the milage isnt too bad. I've only got a couple thousand miles on it buy I've checked it several times at 9.5 to 10.5 with spirited driving. Not sure I would do it again if I was building from scratch with all new parts mostly because if the limited number of stations available with e85, even here in Iowa, but it really doesn't work too badly........Jim Kramer