300i6 question
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300i6 question
I have an 83 f150 with the great 300i6, I want to upgrade the exaughst to the efi manifolds off of a fuel injected 300. Is this swap from the log manifold to EFI manifolds worthwhile, will I gain much power and will the power be noticeable. I know how to do the swap, I'm just wondering is it worth my time for the power gained. And how much torque and hp would I gain. 
Post Fiend
Joined: Jun 2003
Posts: 8,209
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From: Black Hills of SD
Will you be running full duals or using something like the Walker Y pipe to connect to the factory system? If someone did the swap, you didn't know it and the truck wasn't louder, I doubt you would feel the difference. Long term you might see a measurable increase in fuel economy.Also keep in mind you will be loosing the EFE or carb heat, potentially allowing fuel droplets to puddle in the intake so you'll need a heater kit under there just to see any measurable gain in mileage.
If you really want to wake it up, pull the head and do a good clean up porting job.
If you really want to wake it up, pull the head and do a good clean up porting job.
Lead Driver
Joined: Jul 2009
Posts: 6,477
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From: Sheffield, AL
83f150b, I will PM AbandonedBronco. He has an upgraded engine, now, but I believe he started out by using the EFI exhaust manifolds with the original single barrel carburetor and log intake manifold.
Moderator
Joined: Dec 2007
Posts: 7,987
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From: Boise, Idaho
Heya 83f150,
This is the first real major upgrade I did on my 300 in my Bronco. Even with just the stock 1bbl and no other upgrades, it was a very good boost. I also got better gas mileage.
Just be sure to upgrade the entire exhaust. If you just reuse the stock exhaust pipe, you won't be gaining much. If I remember right, my stock exhaust was 1 7/8".
I went with the Walker Y-pipe (45166) and then a single 2.5" exhaust, muffler, and cat all the way back.
I'd say coupled with the 1bbl, it was a good 10 - 20hp boost (seat of the pants guessing) and quite noticeable. That doesn't seem like much, but when it's 120hp stock, that's about a 10 - 15% increase in power. The stock exhaust manifold is very restrictive. I'd say more so than the head. Yeah, the head is restrictive if you want to get some serious horsepower out of the 300, but it flows well enough to get some major boosts out of an exhaust upgrade and a good 4bbl carburetor without even touching it.
This is the first real major upgrade I did on my 300 in my Bronco. Even with just the stock 1bbl and no other upgrades, it was a very good boost. I also got better gas mileage.
Just be sure to upgrade the entire exhaust. If you just reuse the stock exhaust pipe, you won't be gaining much. If I remember right, my stock exhaust was 1 7/8".
I went with the Walker Y-pipe (45166) and then a single 2.5" exhaust, muffler, and cat all the way back.
I'd say coupled with the 1bbl, it was a good 10 - 20hp boost (seat of the pants guessing) and quite noticeable. That doesn't seem like much, but when it's 120hp stock, that's about a 10 - 15% increase in power. The stock exhaust manifold is very restrictive. I'd say more so than the head. Yeah, the head is restrictive if you want to get some serious horsepower out of the 300, but it flows well enough to get some major boosts out of an exhaust upgrade and a good 4bbl carburetor without even touching it.
FTE Legend
Joined: Nov 2015
Posts: 30,935
Likes: 4,124
From: Angier, NC
Heya 83f150,
This is the first real major upgrade I did on my 300 in my Bronco. Even with just the stock 1bbl and no other upgrades, it was a very good boost. I also got better gas mileage.
Just be sure to upgrade the entire exhaust. If you just reuse the stock exhaust pipe, you won't be gaining much. If I remember right, my stock exhaust was 1 7/8".
I went with the Walker Y-pipe (45166) and then a single 2.5" exhaust, muffler, and cat all the way back.
I'd say coupled with the 1bbl, it was a good 10 - 20hp boost (seat of the pants guessing) and quite noticeable. That doesn't seem like much, but when it's 120hp stock, that's about a 10 - 15% increase in power. The stock exhaust manifold is very restrictive. I'd say more so than the head. Yeah, the head is restrictive if you want to get some serious horsepower out of the 300, but it flows well enough to get some major boosts out of an exhaust upgrade and a good 4bbl carburetor without even touching it.
This is the first real major upgrade I did on my 300 in my Bronco. Even with just the stock 1bbl and no other upgrades, it was a very good boost. I also got better gas mileage.
Just be sure to upgrade the entire exhaust. If you just reuse the stock exhaust pipe, you won't be gaining much. If I remember right, my stock exhaust was 1 7/8".
I went with the Walker Y-pipe (45166) and then a single 2.5" exhaust, muffler, and cat all the way back.
I'd say coupled with the 1bbl, it was a good 10 - 20hp boost (seat of the pants guessing) and quite noticeable. That doesn't seem like much, but when it's 120hp stock, that's about a 10 - 15% increase in power. The stock exhaust manifold is very restrictive. I'd say more so than the head. Yeah, the head is restrictive if you want to get some serious horsepower out of the 300, but it flows well enough to get some major boosts out of an exhaust upgrade and a good 4bbl carburetor without even touching it.
Not what I wanted to hear as I used the Walker Ypipe into the stock system less cat only because it was like new from my parts truck.
I don't have mine on the road yet so cant say how good or bad it will do. I also did not drive this truck before doing any work to it so cant compare it to anything.
Dave ----
Moderator
Joined: Jan 2001
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Likes: 2,741
From: Virginia
I think I would run dual pipe down to one of these, and then keep it dual after that all the way to the rear. I think that would pass most inspection places, even though it would not be original.
This is a Magnaflow 94008 that you can get from summit racing.
This is a Magnaflow 94008 that you can get from summit racing.
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I'm gonna go with the walker y-pipe, with no cat to a flowmaster super 44. All 2.5 inch tubing from the y-pipe on out. For heating the carburetor, are there any after market parts that will just bolt up or does it have to be custom made ?
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FTE Legend
Joined: Nov 2015
Posts: 30,935
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From: Angier, NC
Well I bought mine thru https://www.ebay.com/itm/Offenhauser...p2047675.l2557
But they had a falling out with ebay and I cant find their web site as you buy it right thru them.
OR
Could get this one Intake Manifold Heater Kit - Ford 240/300
or make one based on the ones above.
Dave ----
But they had a falling out with ebay and I cant find their web site as you buy it right thru them.
OR
Could get this one Intake Manifold Heater Kit - Ford 240/300
or make one based on the ones above.
Dave ----
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