100 + Hp
Elder User
Joined: Jun 2007
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From: Humble,Tx
well basicly my answer Bill to that question is Fuel Economy,Engine,durability & Longevity. not to mention it Will haul ANYTHING that 302 will and you'd be Suprised how many people will buy a 302(Ford) or 305(GM) just so they can say they've gotta V8
Elder User
Joined: Jun 2007
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From: Humble,Tx
hmm well my take on that is anything you can do to improve efficiency will improve performance and My plans for my 1990 and the 1987 for that matter is an Accel Electronic Super Coil, MSD 6AL-2 ignition computer,an Aftermarket Cam I'm still on the hunt But since I've been told about the Isky cams 256 and possibly 260 grinds those are options, a more free flowing exhaust system, I'm actually contemplating in the long run setting it up with True dual exhaust... other things would involve internal mods porting and polishing the head then port matching it, Higher Compression pistons, one other thing I want to do is convert from speed density to Mass Air Flow. Beyond that I don't know of too much more you could do to this motor I see no reason why you can't get over 200HP out of your 300 EFI however
Elder User
Joined: Jun 2007
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From: Humble,Tx
I'm just now getting back into this, Because for over 10 years I haven't had a running 300 EFI or Ford Pickup period aside from the 87 I got back in 95 but it's a complete restoration candidate after it's prolonged sitting off the road. we parked it about 01 roughly. My point to mentioning all that is. Those two cams I mentioned are likely not the only two you can find and IF I were you I'd look for a Computer friendly cam in the 268-272 advertised duration range. Thats what I want. but I'm rebuilding my 1987s 300 though and am planning to go from I think it's 8.8:1 up to 9.8:1 or 10.25:1 with maximum porting and polishing of the heads etc. I expect my plans will get me close to if not right at 350HP Torque wise I don't know probly round 450-475Ft Lbs or more. ANYWAY my point is you CAN get more power out of a 300 EFI these engines DO have alot of potential waiting to be released
Post Fiend
Joined: Jan 2007
Posts: 7,021
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From: Almost Heaven
LTFOL OKAY OKAY Alright already lol I'll take your word for it. But all the evidence I had back in 95 said otherwise but I'll entertain the possibility their wrong. Abit surprised ford gave false info but either way who givesa damn either way you slice it whether it's 145-150-165 or 2000 HP lol the 300 Straight 6 is a Bad A$$ engine We ALL agree on that right??? no more bloody 
how bout a couple 
instead???
how bout a couple instead???My particular 300 is tired and paired to a heavy automatic transmission so I don't get the benefits you carb'd 300 / manual transmission guys get but I know enough to know that a healthy 300 paired with a manny is something to respect. It will pull the load or break something trying.
Elder User
Joined: Jun 2007
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From: Humble,Tx
Then let me do my own research for my OWN truck lol and I'll try to locate a Computer compatible 268 or 272 Grind Cam that and free flowing exhaust Ought to get you where you want to be I'd think
Elder User
Joined: Jun 2007
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From: Humble,Tx
We all can agree here, the 300 is an impressive gasoline six. It's the only gasser six I would want to have in a working truck. My all time favorite six is the Cummins. Big surprise there, right? Everyone loves the Cummins. I love all I6 engines; I just think they're cool. I love the style, simplicity, smoothness of operation and long life.
My particular 300 is tired and paired to a heavy automatic transmission so I don't get the benefits you carb'd 300 / manual transmission guys get but I know enough to know that a healthy 300 paired with a manny is something to respect. It will pull the load or break something trying.
My particular 300 is tired and paired to a heavy automatic transmission so I don't get the benefits you carb'd 300 / manual transmission guys get but I know enough to know that a healthy 300 paired with a manny is something to respect. It will pull the load or break something trying.
WHO CARES I see an opertunity to trick out the head,Exhaust,fuel system, and Add a Good Aggressive cam or atleast the most aggressive cam that retains computer compatibility anyway this will be a long term work in progress though due to lack of $$$$ unfortunately.
As to the Mini Big Rig engine sold by Cummins HELL YEAH!!!! pehaps when the 1987 is Emmissions exempt I'll strengthen up my front suspension and make myself a Half Ton Diesel truck WITH BOOQOO frame reinforcement!!!!
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Moderator
Joined: Dec 2007
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From: Boise, Idaho
AMV F250,
The EFI 300 isn't nearly as easy to get power out of as the carb'd version. Look for an EFI friendly cam, do a port and polish on the head, and put on a freer flowing exhaust, and you'll notice a difference.
Before anything else though, be sure everything is fresh and good first. Spark plugs, wires, cap, rotor, timing, compression check, etc. No point in putting performance mods on a tired engine.
The EFI 300 isn't nearly as easy to get power out of as the carb'd version. Look for an EFI friendly cam, do a port and polish on the head, and put on a freer flowing exhaust, and you'll notice a difference.
Before anything else though, be sure everything is fresh and good first. Spark plugs, wires, cap, rotor, timing, compression check, etc. No point in putting performance mods on a tired engine.
Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 4
From: Almost Heaven
AMV F250,
The EFI 300 isn't nearly as easy to get power out of as the carb'd version. Look for an EFI friendly cam, do a port and polish on the head, and put on a freer flowing exhaust, and you'll notice a difference.
Before anything else though, be sure everything is fresh and good first. Spark plugs, wires, cap, rotor, timing, compression check, etc. No point in putting performance mods on a tired engine.
The EFI 300 isn't nearly as easy to get power out of as the carb'd version. Look for an EFI friendly cam, do a port and polish on the head, and put on a freer flowing exhaust, and you'll notice a difference.
Before anything else though, be sure everything is fresh and good first. Spark plugs, wires, cap, rotor, timing, compression check, etc. No point in putting performance mods on a tired engine.
Senior User
Joined: Mar 2010
Posts: 231
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From: Lakeland
Why is it so much more difficult to work an EFI 300 than a Carb 300. You would think it would be easier to control fuel flow and improve performance to match mechanical mods. I've searched but never been able to find out if things like the Quarter Horse would work on the OBDI EFI units.
Also, has anyone ever done a full mod workup on the EFI300's? Any writeups? You see articles and writeups all the time for the older 300's but no love for the EFI's. I can work on the engines but don't know nearly enough to really be able to reliably mod out a 300 to increase HP/Tq significantly but if someone else did it and did a go by, I could easily follow it and get the same results. Yes, I'd need a little hand holding.. I'm not too proud to admit it.
Also, has anyone ever done a full mod workup on the EFI300's? Any writeups? You see articles and writeups all the time for the older 300's but no love for the EFI's. I can work on the engines but don't know nearly enough to really be able to reliably mod out a 300 to increase HP/Tq significantly but if someone else did it and did a go by, I could easily follow it and get the same results. Yes, I'd need a little hand holding.. I'm not too proud to admit it.
Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 4
From: Almost Heaven
Why is it so much more difficult to work an EFI 300 than a Carb 300. You would think it would be easier to control fuel flow and improve performance to match mechanical mods. I've searched but never been able to find out if things like the Quarter Horse would work on the OBDI EFI units.
Also, has anyone ever done a full mod workup on the EFI300's? Any writeups? You see articles and writeups all the time for the older 300's but no love for the EFI's. I can work on the engines but don't know nearly enough to really be able to reliably mod out a 300 to increase HP/Tq significantly but if someone else did it and did a go by, I could easily follow it and get the same results. Yes, I'd need a little hand holding.. I'm not too proud to admit it.
Also, has anyone ever done a full mod workup on the EFI300's? Any writeups? You see articles and writeups all the time for the older 300's but no love for the EFI's. I can work on the engines but don't know nearly enough to really be able to reliably mod out a 300 to increase HP/Tq significantly but if someone else did it and did a go by, I could easily follow it and get the same results. Yes, I'd need a little hand holding.. I'm not too proud to admit it.
The EFI is all computer controlled. You can not modify the computer and it only accepts something like a 10% inrease in power.
Bascially, it's you against the computer.. and the computer can't be messed with.
The Carb'd 300's have better low end grunt anyway. They truly are like diesels. The EFI 300's have great power but in my personal opinion serve better as a daily driver than a tug boat - with that said, an EFI 300 is still a tug boat. I'm just saying the carb'd 300 does it better.
EFI 300 makes peak torque at 2,000 RPM.
The carb? 1,400 RPM.
If I were going to build a 300 it would be a carberated version. EFI manifolds, high lift cam, port and polish..
Like I said, somebody else can give you a better answer.
Thread Starter
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Freshman User
Joined: Aug 2010
Posts: 32
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From: Newmarket, Ontario
now i regret buying my ngine (truck) my brothers 5.7l 350 gm is carbed and is loud aS HELL AND HE CATCHES ME SO QUICK 
oops did not mean to hit the caps lock
grrr how much is a carborated 300 anyways and if my efi ever blws how hard is it to switch to carbed or can i carb it now?
oops did not mean to hit the caps lockgrrr how much is a carborated 300 anyways and if my efi ever blws how hard is it to switch to carbed or can i carb it now?
Elder User
Joined: Jun 2007
Posts: 759
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From: Humble,Tx
nothing to Regret man you can't go wrong with an 300 EFI or otherwise and as far as the GM your talking about Dude 2 more Cylinders and 50Cid thats a significant advantage right out of the hole nevermind if that 8 cylinders been modified beyond stock Vs. a Stock Fuel injected 50Cid Less inline 6 cylinder Don't sell the 300 short it WILL grow on you especially if you get it running really good
Don't sell the 300 short it WILL grow on you especially if you get it running really good
Elder User
Joined: Jun 2007
Posts: 759
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From: Humble,Tx
as per cost of carbureted vs. EFI first questions do you have to pass an Emmissions test??? if so does the vehicle being inspected have to have all the original emmissions equipment and also do the require any upgrades have to be an original option from the factory to be legal on the truck IF it does have to be emmissions tested. cause if any of these variables come into play if it's EFI they won't give you an inspection sticker for it if they pop the hood and see a carbureted 300 in there instead of the EFI that was OEM