460 EFI conversion + a few goodies
Now, let's translate.
I have a 1985 F-150 short bed. First off, I removed the heavy short bed and installed a lighter bed from a 196 F-150 flareside. I've got a 1971 460 with a 10.5:1 compression ratio, upgraded cam, performance intake and exhaust (headers), everything you could put in a 460. I've also got a built stage two C-6 with the billet C-6R super servo and the B&M stage two shift kit.
I'm going to remove this setup and install a 1989 EFI 460 with an E4OD and a Vortech supercharger kit. I figure my truck should be lighter than his.
The first thing I need help with is deciding which axle ratio I should go with. If I go with 3.27:1, I'll keep the low stall torque converter for better torque. If I go with 3.73:1, I might go with a 2400 RPM stall torque converter. If I go with 4.10:1 (like the Lightning has), I'll install the 2400 RPM stall torque converter.
I do plan on installing 30 lb. injectors and an adjustable pressure regulator, with a mild cam and dual exhaust, and I will be doing some port and polish work on the heads. I may also have bigger valves installed.
All thoughts are apreciated. I know the 4.10:1 performs great with the 351 (Windsor) in the Lightning with an E4OD, but is it too much gear for a 460 EFI built for torque? I had 3.55:1 with my C-6 and was really pleased with the performance, but it ran pretty hard doing 70 MPH. I want a tail kicking setup in my truck, not a slug, but I'd also like it to pull harder than my carb setup, and at least as strong as a stock first generation Lightning.
From what I gather, you're looking to build up your truck to whoop your friend's *** in drag races, run good at highway speeds, and be able to tow his truck backwards if you got in a pull competition.
As far as the gear ratio, I'd take a look at what Fal Grunt says about his setup. With 4.10:1, he has lots of power, but even in overdrive it runs hard at highway speeds. 3.55:1 would be a bit better for highway speeds (not to mention mileage), but may not give you the low-end power you would want coming off the line.
As for the engine, I would say keep what you got and convert to EFI, it'll be more adjustable and about the same amount (I imagine) as a swap. Throw in the E4OD for better mileage (and same reliability) and get the Baumann controller for it. It lets you set shift points which is real nice, and shifts better than stock.
For the EFI conversion, I'm kind of partial to Mass-Flo. I've seen guides online of the conversion, and it seems to work out pretty well - all Ford parts you can buy at the auto store. A four barrel intake manifold (with TIG welded injector bungs), a 1000CFM throttle body, high-flow fuel rails, performance distributor and coil, tuneable ECU, everything you need for installation, and they even help you choose the right parts for your application. Only $3200 for the 460's (only downside I hear is that you want to do cold air intake and mount the MAF sensor in the tube, because where they want it mounted has lots of turbulence and messes up the readings).
The supercharger wouldn't be bad either. Or twin turbos (a few people have done that conversion).
His Lightning has an approximate curb weight of 3900 lbs. A stock 1985 F-150... can't find the weight for that online. You might go get it weighed.
the factory setup has very narrow parameters to work in and any modifications usuallly require you to re-flash the computer to make it work properly.
as the previous post mentioned, i think you will be better off with an aftermarket efi system. they are a lot more adpatable and user friendly then the factory stuff.
rgds
Mike




