what carb should i use?

[wildpony1986]

i have a 1977 F-100 with a 302, edelbrock 289 series intake mild cam full length headers and i just dont know what carb i should use to get good power but still get decent gas milage?

 

[DNFXDLI]

5-600 Vac secondary carb and how much you have your foot in it will have a lot to do with your fuel economy.

 

[wildpony1986]

does it matter what brand?

 

[F 150Cobra]

good power and good gas mileage just doesnt goes in the same sentence .. but yeah an eddy 600 vac sec will be good


oh and welcome

 

[DNFXDLI]

does it matter what brand?

Not really..Holley and Edelbrock are the most common...there is Barry Grant (speed demon), Pro-Systems etc...comes down to what you want to spend and how comfortable you or your tuner is with a particular brand.

 

[dakonthemountain]

I agree with the Eddy carb.. I've got a 650 on my truck and LOVE what it did for my performance.

Oh, and as far as mileage is concerned....decent is a relative term!

 

[wildpony1986]

thats the reason i said decent...which means more than 5 miles to the gal

 

[DNFXDLI]

A quick calculation shows that a 302 running at 85% VE would require a 450CFM carb...at 100% VE it would be about 525 CFM...don't oversize the carb.

 

[SuperCab]

A quick calculation shows that a 302 running at 85% VE would require a 450CFM carb...at 100% VE it would be about 525 CFM...don't oversize the carb.

x2. A bigger carb is not better, especially on a smallish engine like your 302...

600 would be too big imho....

 

[rickpilgrim]

For the best mix of performance and economy on your combo, 525-570 cfm w/vacumn secondary would be the best way to go.

 

[cipsmithers]

1977 ford f-100 style side
302 smallblock
c-4 tranny

1986 mustang gt

Welcome!

I would agree with what is previously stated. No more than 600 or so.

Btw- ford doesnt classify engines by big block/small block. there are engine series.

 

[Mil1ion]

if you go 4bbl you should have a 4bbl intake and heads.

otherwise a 500cfm 2 bbl would be max.

it is the air and compression that makes power. the engine in stock form can only burn so much fuel

 

[DNFXDLI]

A smaller 4 barrel will keep the air/fuel velocity higher than a large 2 barrel...which will result in better atomization. Using a 4 barrel carb will not mean that you need 4 barrel heads....a 4 bbl 351 head would be nearly useless on a truck unless you are going to be turning 5000rpm+.

 

[Mil1ion]

That's right, It depends on the application

2bbl = more torque at bottom end

4bbl = more HP at higher RPM

Hmmmm, What do you really want to do with this engine and/or willing to sacrifice ?

 

[DNFXDLI]

How are you arriving at that conclusion Dennis?..specifically the more torque with a 2bbl part of that statement.

 

[SuperCab]

It may also be worth while to mention that a 500cfm 2bbl and a 500cfm 4bbl do not flow the same volume.

CFM is measured differently between 2bbl and 4bbl carbs...

 

[1985 Ford F-150]

If the intake ports are bigger on the 4bbl heads then it will give it more top end power. Smaller ports are for low end.

 

[TexasRho83]

2 BBL Holley factory on 78 Ford?

 

[DNFXDLI]

Probably from a U-haul truck...that would explain the govenor.

 

[wildpony1986]

i have a new edelbrock 289 series 4bbl intake and it has 4bbl heads...thanks for the info