Have the opportunity to buy a '91 300 engine for $300. I have an 82 f150 with a carbed 300 that I'd like to swap it into. Is it worth the trouble to convert the carbed 82 truck to efi? The efi is fairly completed, but not with a complete wiring harness. I do have another 91 f150 with the same engine that I can use as a "guide".

Or, should I swap out the intake on the $300 efi motor with the carbed intake on the '82? Would I have to change anything else if I go from efi to carb?

 

To convert the EFI block to carb, it's pretty much a bolt in, except that you won't be able to use a mechanical fuel pump. The EFI blocks have the boss, but it isn't cut out, easiest just to run a electric pump.
Evan
1982 F100 SWB
300 HD: Cliffy 290H, 9.1:1 compression, forged everything, ARP'd bottom end/Hedman hedder/dual 2½" exhaust
NP 435/2.75 geared 9"
1986 F150 HD, 300 HD/needs a NP 435/4.10 geared 8.8
70,000 miles
1984 F150 XLT Lariat parts donor, 351W/C6/9" LOADED to the hilt, 201,000 miles
1980 F100 Custom, 300/Np 435/2.75, 58,000 miles

 

From carb to EFI could be complicated. ALL the sensors and the computer along with the wiring harness has to be transplanted. Going from EFI to carb no problem just swap the parts.

Bob

 

I have put a fuel injected 300 in my 78' F150, if you have a little time and patience it is quite easy.

The EFI wiring harness and sensors are pretty much a stand alone unit, once you seperate it from the rest of the wiring all you have to hook up is a few power wires. So it is not complicated at all just get yourself a wiring diagram and you will have no trouble.

The Fuel system will have to be made a High pressure system because the 300EFI runs at about 50-60psi. A return line to the gas tank is also required. I am not sure but you could probably just use a gas tank out of an EFI truck and then you would have the fuel pump in the tank. The 300 also requires a High pressure fuel pump which is mounted on the frame rail. What I did was just bought a MSD high pressure fuel pump and used just it, it has plenty of flow and pressure to feed the 300, I believe the 300 needs 16gal of flow per hour if I remember correctly.

The accesory brackets and all that might have to be changed also as the EFI motor uses a serpentine belt.

Your exhaust will have to be modified as the EFI motor uses a dual exhaust manifold. You will also have to install a O2 sensor in order for the system to operate correctly.

I see you said that you don't have the wiring harness, what I did was went to the junkyard and pulled all the odds and ends of of a van with a 300 in it. I got the motor, wiring, accesories, and everything else I could grab for $250.

So if you have a fair bit of knowledge and/or the time to figure it out it is not really all that complicated, at least no more than any other engine swap.

Any thing I missed or you want explained more let me know.

Good Luck,
David Wild
78' F150 EFI 300six
78' F150 300 six
79' F250 351M
https://www.ford-trucks.com/user_gallery/sizeimage.php?&photoid=431&.jpg

 

G'day Ford men

I am looking into rebuilding an old truck with some new 'tech'. From a lot of research on the Internet, I have been told that the 300ci Inline Six is the biggest of all other sixes with a lot more torque than the 302 Windsor V8.

I am not a carby guy and I would like to ask when the first year the EFI 300ci six came out and in what Ford truck model? so I know what motor I am looking for to plant in my planned 1978 F-150 Supercab. Clifford Performance boasts they can do the 6=8cylinder conversion with Stage I and Stage II engine kits to maximise engine potential with more horsepower. I ought to get a full State II kit and get it shipped to Australia and get the engine work done on the EFI 300 I6 for a Christmas present :-X12

Just to double check, does the 1978 F-150 Supercab have rear seats along with the front seats? (Like the 4 door crewcabs do but with only 2 doors)

Any help will be much appreciated

Phil

 

I just wanted to make another note, does the 300ci I6 have Multi-Point? (One Injector for each cylinder, 6 injectors I mean)

Is there any EFI 300 I6 with Multi-Point EFI system?

Multi-Point EFI Improves fuel economy and power as well, the same to a 1992 EB Ford Falcon II with Multi-Point 4.0L six.

 

Beginning in 1987 the 300 went to EFI. They were all multipoint except for the sequential 1996 models, but I'd stay away from that, OBD-II would be a lot more complicated to swap.

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[font color="green"]1995 F-150 Supercab XLT 4x4 302 M5OD 8' bed [/font]31x10.50's
[font color="green"]1986 F-150 4x4 300 I6 NP435 [/font]Warn hubs, DeeZee bed caps, '96 XLT bench seat, new paint job

 

Thanks Brown 4x4 for your help

Now I can go look for a 87' 300 EFI motor and put it in my garage until I find a good 1978 truck.

Thanks mate