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I have a chance to get a F150 4x4 rolling frame everything there including a 390.I want to put my F250 body on it so I can have a 4X4. So here is a poll and post your opinion.
you can probably get almost the same mileage with either of them as long as you don't floor it at every stop sign and keep a steady speed of about 60-63.
i vote for what ever you want to do. get what you want.
but if i had both offered to me id choose 390, more Hp easy to get high HP numbers and the c-6 will hold them ponnies.
Just me 2 cents.
Mitch
Thats true but I'm also looking at gas mileage too.
I get 15MPG with a 351W but its fuel injected. I think the differences in mileage would be negligible with a carb. How you plan on using the truck would determine my decision. Towing and wheeling I would go C6 with the big motor. If you are just commuting to work and light hauling I would go with the C4/351. Just my opinion.