Do i need to modify my 73 f250 at all to burn e85?
i have a rebuilt 460 in my 73 f250 is there anything that needs to be done to burn e85? is it better to mix it 50/50 maybe. i also have a 87 sentra i am just putting an new tank in it. i see some sections of thge line are rubber. its a carbeurated car. is there any thing that i need to burn it in that? thatnks for your advice...
Those threads are full of un releated stuff to your question with exception to the carb mods.
Best would be to buy a carb set up for alchol or rebuild yours using alch friendly parts. The rubber parts will dry out over time if not changed to alch friendly pieces. I am running e85 in my 1965 with the 300 6 and mpg is not much different. You may want to go with a better quality fuel pump as well due to any rubber exposed drying out over time.
There are all sorts of mods that need to be done for reliable service besides the carb. Alcohol does not "dry up" the rubber. It actually swells it and the rubber cracks from the strain releasing small particles and eroding away.
Alcohol will give lower mileage but some people will report equal mileage due to the tuneup performed while converting. Of course any good tuneup will give better fuel mileage in a neglected vehicle. The same claims are made by TV infomercials for all sorts of performance enhancers...