Project 1977 F100 - New radiator + electric fan!

[slownugly]

I'm surprised nobody has suggested the trusty straight 6.( if they are available in aus) most of them came with 5 speeds. I'd grab a cheap donor truck and start swapping. Not only would it be a much more efficient engine but it would drop some weight and still have enough torque to tow or haul.

[Stacygifford]

Originally Posted by slownugly

I'm surprised nobody has suggested the trusty straight 6.

The straight 6 was one of the most reliable motors ford ever produced, and gave decent mileage. That coupled with your mods, I see no reason you couldn't break 22 mpg.
Great work BTW

[ron]

My son and I presently run a 250ci inline six in a 67 mustang .Lead foot (my son) only gets 15-7 mpg I do much better 19-22 . the good thing is that the 250 i6 ford will bolt up to the same bell housing as the 289-302 V8s and ? it also weighs 150 lbs less