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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 07-22-2010   #1 (permalink)
meiring37ford is offline Apprentice


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Default Best 4 barrel carb for 1965 mustang

Thought I'd be cool since my 2 barrel carb had been rebuilt twice I installed a 4 barrel manifold with a 1404, 500 cfm Edelbrock carb. I have re-jetted once and still the gas mileage is unacceptable. I do not get on it and drive at 65 on the freeways. Is there a better carb for my car. It is a relatively stock 289.


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Michael M.
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Unread 07-22-2010   #2 (permalink)
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I had a Holley Street Avenger 570 CFM on my mild build 289. I was getting 27/28 MPG down the highway. My car has a Tremec 5 speed .63 OD with 3.25 rear. I changed to a Speed Demon 575 mechanical secondary carb and got about 25MPG ( also changed a few other things ).
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Unread 07-23-2010   #3 (permalink)
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Default What is acceptable?

Quote:
Originally Posted by meiring37ford View Post
Thought I'd be cool since my 2 barrel carb had been rebuilt twice I installed a 4 barrel manifold with a 1404, 500 cfm Edelbrock carb. I have re-jetted once and still the gas mileage is unacceptable. I do not get on it and drive at 65 on the freeways. Is there a better carb for my car. It is a relatively stock 289.


Thanks,

Michael M.
First - what is acceptable/unacceptable?
Second - if you drive 65 mph with no overdrive, you are going to use some gas -
I'm guessing, but with the standard C-4 tranny, I would say 16 - 17 mph would be tops - anyone else think different?

I would look at an AOD swap if you do a lot of freeway driving.
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Unread 07-23-2010   #4 (permalink)
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I'm also curious about carb sizes, I'm pulling my hair out deciding to go with either 500 or 600 cfm :o

meiring37ford, what did you like/not like about your 4bbl setup?
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Unread 07-23-2010   #5 (permalink)
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I'd love to see 15-17 mpg with my 4100! But then, fuel economy wasn't the issue then that it is now, and I drive it like a maniac. I have this phobia about the secondary throttle shaft seizing up if I don't use it enough.
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Last edited by Joes72/65; 07-23-2010 at 06:46 PM. Reason: more
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Unread 07-23-2010   #6 (permalink)
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Quote:
Originally Posted by Joes72/65 View Post
...... I have this phobia about the secondary throttle shaft seizing up if I don't use it enough.....
Now THAT is the cleverest excuse I have ever heard in defense of being a leadfoot.:p

What kind of mileage are you getting? I have a year/model correct 4100 I was thinking of putting on my stock 2v 289. Theoretically, if you stay out of the secondaries they should do as well or better than the 2100.

I've have never really checked the mileage on my 2100. Seems the 16 gallon tank empties pretty quick but then all my trips are very short. I have never had it out on the highway for a full tank of gas.

As for the 3 spd C4, there were plenty of pre-smog small block V-8's that got better than 20 mpg.
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Unread 07-23-2010   #7 (permalink)
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I get about 12 mpg with the 4100 on a 302, and about 14 mpg with a 2100 on a 351. Keep in mind, though, that I take a lot of short trips, so a high proportion of fuel is burned warming up. With the 4100, you can wind the engine up pretty quick. The 2100 will not let the motor get much past 3400 before you're going as fast as you wanted to, anyway. It's actually a faster car, it just takes a lot longer to get there. (Awesome for freeway cruising, though - it barely breaks a sweat at 70!)
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