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post #1 of 15 (permalink) Old 10-04-2010, 07:32 PM Thread Starter
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Power Gain question Ford FE 390

hello again im lil tired of my 68 390 2 barrel. a local man has a 390 gt 4 barrel intake that will fit and can sell it to me for 75 dollars. im just curious what kinda horspower gain ballpark figure i would gain going from the stock intake and 2 barrel 2100 autolite carb to a 390 Gt intake with a 600 4 barrel carb.
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post #2 of 15 (permalink) Old 10-04-2010, 09:33 PM
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Re: Power Gain question Ford FE 390

I am guessing 25 or so.
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post #3 of 15 (permalink) Old 10-05-2010, 12:05 AM
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Re: Power Gain question Ford FE 390

Even better is the change in sound when the 4v secondaries open-up. It's worth it just for that!

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post #4 of 15 (permalink) Old 10-05-2010, 07:06 AM
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Re: Power Gain question Ford FE 390

No more Power is my experience, just sound.

I put a 4V intake and carter on my 74 F-250 390 2V truck and got a big disappointment.

The 2V gave me instant power whenever I put my foot down.

The 4V was Great for sound going out my dual exhaust but crap for instant performance.

2V is NOW, and 4V is Wait for the RPM's and the secondaries to open before getting any ass out of the engine.

In a more realistic setting it's not the carb that makes the engine go hard, it's the combo of the Carb, the cam and the flow of the intake, heads and exhaust....
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post #5 of 15 (permalink) Old 10-05-2010, 08:25 AM
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Re: Power Gain question Ford FE 390

From what I understand, you'll be better off getting a set of headers for that FE and getting the 2bbl tuned to match. Also expect an increase in mileage.

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post #6 of 15 (permalink) Old 10-05-2010, 08:44 AM
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Re: Power Gain question Ford FE 390

Yep, deal with the exhaust first. Unless your vehicle came with factory headers, the exhaust will always be the most restrictive thing in a stock engine. If you replace the intake/carb first, you can introduce more fuel/air, but it's got nowhere to go. Stock exhaust can't even keep up with what your current 2bbl setup can supply.

Whenever you want to increase fluid flow in any device, always start with the outlet and work your way back. That's just a basic engineering principle.


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post #7 of 15 (permalink) Old 10-05-2010, 08:56 AM
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Re: Power Gain question Ford FE 390

Quote:
Originally Posted by FEandGoingBroke View Post
No more Power is my experience, just sound.

I put a 4V intake and carter on my 74 F-250 390 2V truck and got a big disappointment.

The 2V gave me instant power whenever I put my foot down.

The 4V was Great for sound going out my dual exhaust but crap for instant performance.

2V is NOW, and 4V is Wait for the RPM's and the secondaries to open before getting any ass out of the engine.

In a more realistic setting it's not the carb that makes the engine go hard, it's the combo of the Carb, the cam and the flow of the intake, heads and exhaust....
Are you going to listen to this totally true crap that FE is feeding you or are you going to "man-up" and put that damn GT intake on and get the sound of an FE in your ears and say to yourself "Well Done-Well Done" ??
It will be a task, but I heard my first FE in '64 at 14 years of age and my
first Huey helicopter in '68 at 18, and both sounds still make my look up and smile..You deside...

P.S. If you add the headers, ask Santa for a set of 4.11's..
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390 GT/ C-6 /4.11
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post #8 of 15 (permalink) Old 10-05-2010, 12:29 PM
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Re: Power Gain question Ford FE 390

hahahhaahaaaa. A 4V FE is certainly sweet sweet music!
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post #9 of 15 (permalink) Old 10-05-2010, 02:09 PM
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Re: Power Gain question Ford FE 390

1 - Headers and good duals
2 - Recurve the distributor and open element air cleaner
3 - Gears for intended use
4 - Good 4 barrel intake to match use of motor
5 - Cam to match intended use
6 - Headwork

Ideally 1-3 are done if following a budget

4-6 usually done all at once after 1-3.


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post #10 of 15 (permalink) Old 10-05-2010, 04:22 PM Thread Starter
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Re: Power Gain question Ford FE 390

oh i would love to put headers on it my friend does exhaust work at his garage and is ready to put some duel flowmasters on it for me but i want to put headers on it first my problem is iv not seen any place i can get headers for a 68 galaxie 500 and im afraid to try to guess what would fit. i really dont want shorties but if thats all i can find then i will use them. i just dread trying to get the exhaust bolts out my luck they will just break off and i dont have much experiance on getting out broken bolts.
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post #11 of 15 (permalink) Old 10-05-2010, 04:33 PM
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Re: Power Gain question Ford FE 390

Some, or maybe many, 2 bbl. 390's had small intake ports compared to the 4 bbl. ones.
So if you put on that 4 bbl. intake, it's large ports will be trying to feed into the small ports in the heads. This is a significant mis-match and will likely result in no power gain. I don't know what year the small port heads came out but you might want to do some research first. Or maybe just pickups had the small ports, not sure.
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post #12 of 15 (permalink) Old 10-05-2010, 07:34 PM
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Re: Power Gain question Ford FE 390

Why are you so against shorty headers? Shorties would be a vast improvement over the stock log headers. Cheaper than full-length tubes if you're on a budget. As far as applications go, remember that the 65-71 full-sizes all share the basic frame and steering, and they were all available with FE engines. Hooker 6130's fit my 67 with a 390 like a glove. Main difference on 68 and up is the exhaust port location on the head. A little modification to the header flanges and you're in business.

And you can't let fear of breaking a bolt or two stop you from doing things to your car. It's 42 years old, you're going to break some bolts, round off some heads, and have other unforeseen frustrations. Just give things a good soaking with penetrating lubricant and hope for the best. I've torn down a lot of 30+ year old engines. I could count how many exhaust bolts I've broken off total and still have fingers left over.


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post #13 of 15 (permalink) Old 10-05-2010, 07:42 PM
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Re: Power Gain question Ford FE 390

Quote:
Originally Posted by FEandGoingBroke View Post
hahahhaahaaaa. A 4V FE is certainly sweet sweet music!
An 8V FE is with icing on top.

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post #14 of 15 (permalink) Old 10-06-2010, 07:00 PM Thread Starter
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Re: Power Gain question Ford FE 390

im not fully against shorty headers just been told over the years they dont perform as well as full length. i seen the hooker 6130's online them are about the only one's iv seen for a 68 but if 65 to 71 use the same frame then i should be able to find some that will fit. i am on a budget so i may go with shorty headers. As far as the intake ports being larger than the ports on the heads i can port them out cant i. i hope i can anyway.
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post #15 of 15 (permalink) Old 10-07-2010, 04:57 AM
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Re: Power Gain question Ford FE 390

Quote:
Originally Posted by south418 View Post
im not fully against shorty headers just been told over the years they dont perform as well as full length. i seen the hooker 6130's online them are about the only one's iv seen for a 68 but if 65 to 71 use the same frame then i should be able to find some that will fit. i am on a budget so i may go with shorty headers. As far as the intake ports being larger than the ports on the heads i can port them out cant i. i hope i can anyway.
Any header is leaps and bounds above the exhaust manifold on an FE

As far as breaking bolts, find an old school shop and pay them. If they heat the top of the casting for every top bolt with a torch, they will just unbolt. If you dont, they will all break across the top

Even if the ports mismatch, don't port the head, the bottom mismatch doesn't mean anything, all the major flow is across the top of the port and even Ford knew that with 428s and 429s and assembled with a mismatch. If it was a fully ported set of heads, etc, then matching is good, but not worth it for you.

Focus on saving the money for the exhaust, if the car is nice, it'll be worth paying someone to do a real clean exhaust with whatever header you can afford.


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