I have a 88 F-350 2wd 460 f. i. 5 speed 3.55 10.25 ford rear w/265,xxx + miles. Worked hard under 3000RPM's. Motor in truck needs rebuilt +addition senser work. Have 85 460 complete needs rebuilding. Which one would be best for a low end torque motor? And the cheapest? Considering the F.I. motor needs additional sensers. Which would be better all around carb or F.I. motor? Any advice on how to rebuild the best one for low end torque would be helpful. Thank You.

 

A f.i motor stock usually will give you more reliably than a carb motor and better starting and better fuel milage, but the cost of the carb motor would be cheaper if you put them both back to stock specs. Me personally i would go with the F.I engine, but that is just me. I also think back to stock the F.i engine will give you more low end torque than a stock carb engine.

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85 f250 460 4x4 c6
81 f250 351m 4x4 c6

 

88 350 workhorse


The hp and torque numbers are a bit higher for the EFI engine.

And like mentioned by jpd the reliability and fuel mileage advantages of the EFI will be hard to beat with a carbureted engine. Plus no hassles with wiring.

You could probably also find an computer friendly RV cam for it. Crane and maybe Comp Cams. Someone here with an EFI 460 could give you some help with that. Or look at these manufactures web-sites.

If you are going to be working it, you'll want to keep it pretty simple.

 

Thanks you guys are great. Sorry it took me so long to respond back. But i'm going to build one of them and I need to know which one would have better low end torque? Concedering the FI motor is going to need $700.00 - $1000.00 additional computer parts. If I build the motor I've been told the computer will not be able to adjust to the new motor. I pull on averge 18,000 pounds. The FI has problems doing this before it wore out.

 

Actually, the early EFI engines have less power than the late carbed ones... It's been a while since I had my spec books out, but, I remember it being 10 or 15 more hp and FT/LBS in favour of the 86/7 Carbed 460 over the EFI engine. The Torque peak on the EFI engine is advertised around 600 rpm lower though.

 

88 350 workhorse

I'd stay with the EFI engine, buts thats just my opinion.

As I mentioned, you can probably find a computer friendly cam, thats about all you will be able to do, and not make the computer go crazy.

 

88 350 Workhorse,

I agree with Superdave, an EFI 460 will pull the load and net you slightly better fuel mileage. The only time I would go with a carbed 460 is if you plan on highly modifying it.

I would suggest changing to 4:10 gearing and adding headers and dual exhaust. Those made much more differance on my EFI 460 than the cam did. Looking at my owners guide your 3.55 gearing limits you to a GCWR of only 11, 500 lbs. The 4.10 gearing ups you to a GCWR of 16,000 lbs. with your 5-spd.

Switching over to a C-6 and 4.10 gearing would get you up to what you actually have had trouble pulling...18,500 lbs. GCWR.

Deen