390 to 460
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What condition is your 390? Good dual exhaust at least, with crossover pipe just behind the trans. Headers are preferred. You can do the 4bbl but what fun is that if you run around on the primaries?
You thinking of a rebuild?
If you are carting something heavy, you are going to flog the 302 and it will be almost a thirsty and somewhat to very unsatisfying.
Your best bet for economy is pumping up the tires, tune up the engine and slow down.
You thinking of a rebuild?
If you are carting something heavy, you are going to flog the 302 and it will be almost a thirsty and somewhat to very unsatisfying.
Your best bet for economy is pumping up the tires, tune up the engine and slow down.
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Face it, you're married to that FE without a donor vehicle to steal parts from for your 460 transplant. On the positive side, your 390 doesn't have to be a slouch -and won't be with a few of the right parts. A stated earlier, a free-flowing exhaust, 4bbl carb and a prudent right foot would be a good start. I can see no reason why such a combination shouldn't net you 13 to 14mpg.
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Super Moderator
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This is an F100, correct?
Your 9 inch swaps out in less than two hours, including beer run.
Check your ratio.
Dear Old Dad's had 3.25s.
Since you are carrying a hefty load from time to time, you probably shouldn't go below 3.0s, but first, what ratio do you have?
Your 9 inch swaps out in less than two hours, including beer run.
Check your ratio.
Dear Old Dad's had 3.25s.
Since you are carrying a hefty load from time to time, you probably shouldn't go below 3.0s, but first, what ratio do you have?
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
No such thing as 357, the tag from this vintage vehicle will either have WDM- something on it, D3TA-something, or for example 3L50 if LS, or 350 if not.
What is the AXLE code on the Warranty Plate?
It'll be either two or three digits.
1973/76 F100 & 1975/76 F150 (the usual) 9" ratios: 3.00-1 / 3.25-1 / 3.50-1 / 3.73-1
What is the AXLE code on the Warranty Plate?
It'll be either two or three digits.
1973/76 F100 & 1975/76 F150 (the usual) 9" ratios: 3.00-1 / 3.25-1 / 3.50-1 / 3.73-1
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