Just got a 1994 Ford 300 six EFI for my 1951 F1 truck. Should i leave it EFI or change it to a carb such as a Autolite 2100? What problems might i expect using the EFI head with a carb? Seems a carb would be simpler. Any and all opinions are appreciated. Thanks...jack
Well, the politically correct answer on this board is of course a carb. It'll be simpler to plumb, requires near-zero wiring, etc. You'll be giving up a bunch of HP over even the stock Ford EFI to do that, of course, unless you go to multiple carbs and pay attention to the mixture distribution, but it depends on what you're trying to achieve.
Use the efi exhaust manifolds to split it into duals, find a clifford or edelbrock intake and put a carb on it.
I had a ton of electrical problems with a stock 300 6 in my old bronco. It was a great engine with a 5spd behind it though.
Dirtyjoe writes I Have this set up on an EFI head with headers, it works pretty good but there is much more to it that you can read on the ford six forum.<!-- / message -->
Carb. Get an Offy 4 barrel 2-port manifold and run a 500 or so cfm Holley. The EFI head flows better then any other head Ford put on those motors, so you are fine there. And like mentioned above, split the exhaust manifold or put an aftermarket header on. Get rid of the EFI distributor and switch to an older Dura-Spark II off a carb motor. If you swap cams to something like a Comp 270H or even a little bigger you will be able to go SBC hunting. Good Luck.
I would keep the efi and just keep the hood closed. Better MPG and power and the wiring does not get any simplier if you have the donor truck. I have a efi 302 in a old comet and it is the best running and best MPG of everything I own. Trouble free and the most HP of all cars also. Just not H.A.M.B friendly but if you asked.....
I would go with an aftermarket multiple carb set up myself. EFI would run better & less maint. but more work to install. When I worked at the dealer I recall seeing 300's coming in with warped manifolds. Must be from the heat because later EFI units had a blower fan that would direct air towards the injectors to help cool that area down.
You have a good strong engine. In my opinion one of the strongest US big three manufactured inline's. Look at the photos. One blown, one with a four barrel and the don or side draft carburetion. What you do will depend on how much you want to spend. The side draft Webers are impressive but then there are so many options opened to you. Normbc9
The EFi's don't really have that much more power nor do they even get much better mileage than a stock carbed engine. I've had a few of both and the best (20ish) mpg I got on a couple different 79-80 models. IMO. Plus the plenum is huge ugly and lays over the top of the engine. All that being said it is still a pretty good way to go. I have an O/T truck I put a 300, 260H cam, efi exhaust, Offy C intake with 390 Holley. It runs great but it's in a 3/4 ton that I work the piss out of and I wouldn't do the cam thing again, stay stock for more low end. Also I used a GM module on a Dura spark II dist with an efi coil, pretty good set up. Don't forget to put an intake heater on if you go with efi manifolds or headers. Mileage will most likely **** if you don't. I don't have one on mine and 11-12 is tops with 4.10 gear and 5 speed. When I get around to it, I'll make a heater and most likely ****can the Holley for a 2100 or Rochester 2GC I also recommend going to Fordsix.com. All the good info is there. probably best to lurk a while and avoid/ignore the 2-3 guys who post the most, pretty opinionated. Seems like I've read the EFI head isn't the best for carb, some valve shrouding or something. One thing that is worth while is a good clean up on the ports. I ported one many years ago, actually the only real port job I ever did, and that is the single best thing you can do to a 300 IMO. Still, I'd keep the sbc hunting pretty much to stock 305s in full sized trucks.
I just rebuilt one for a customer this summer but it was a stock carbureted engine. Did the 260H cam, with 1.6 rockers and guideplates, EFI exhaust, Offenhauser DP intake, Holley 390 carb, DS2 distributor setup. That thing runs great and has tons of torque. I'm probably going to find one for my next project I was so impressed. I didn't try porting, but that is supposed to really wake them up.
I have a 300 inch ford in my f 100 carbed ! but I used the split exaust from a efi motor sounds cool with a pair of gl*** packs run all the out to the back bumper
There was supposed to be a cross flow head in the making but I think it dies out. Some guys furnace brazed 351 cleveland heads together and made screamers but as I understand, the stock head just isn't capable of unleashing the real potential of a 300, no matter how much you do to it. Still fun to play with.
GET A 240 HEAD !!!! GO WITH THE CARB 240 head pumps the compression up to 10;1 or so i have heard .. did it to mine and did a little head work as well runs great and torque monster in the econoline.... Put an aod behind it and get 28 mpg...
Your saying your getting 28 mpg n your econoline? I think I have to wave the bull chit flag on that one.
Get a Clifford or Offy intake and put a carb on it. Something in the 500-600 cfm range. I used to race a 300 six stock car. You can build one from cheap to sky's the limit. Someone made an aluminum cross flow head 20-25 years ago. They sold for $5400 (bare) back then. I don't know anything about the EFI head. The 240 head had smaller combustion chambers. Both the 240 and 300 heads needed the ports opened. Especially the bowls around the valves. You can put bigger valves in them. Mine had 1.6 and 2.02 or 2.06? SBC valves. The 300 is a torque monster. You can definitely go SBC hunting if you keep the distance short. the 300 is a great engine but economy is not it's strong suit.
There is or was a holley efi kit for 300 ford sixes, very popular with the commercial truck users.. I have 300 six with oem efi, no problems in 15years, the ems guy
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