carb size?

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carb size?

Post  bbfstanger on November 16th 2016, 7:43 pm

Just looking for opinions on carb size.
I have a 585ci Ahead drag race deal, fairly lightweight mustang with a glide.
How big of a carb is big enough or too big?
I was thinkin of a qf 1450 or holley equivalent, what about a 1600cfm domi?
The other option im kickng around is a tunnel ram and 2 1150's? but I'm prob gonna stick with a single.


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Re: carb size?

Post  BigDave65 on November 16th 2016, 10:17 pm

I've got a 588" A head with a 1250 Pro Systems that runs pretty darn good. Been 5.teens at 134. It ran good on a 618" combination as well.
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Re: carb size?

Post  bbfstanger on November 17th 2016, 5:13 pm

i have a 1350cfm pro systems carb already sounds like itll be big enough.

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Re: carb size?

Post  Lem Evans on November 17th 2016, 5:49 pm

What size are the butter flies on your 1350?

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Re: carb size?

Post  larry552 on November 18th 2016, 12:47 am

I have a custom deal I think it flows about 1225 cfm on a 582 A Head it has been 5.20 at 136
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Re: carb size?

Post  BBFTorino on November 18th 2016, 2:54 am

The carb should be matched to the engine's airflow needs. The problem is, most folks cannot afford to buy multiple carbs in different sizes to find out which one is the one best suited for their engine!!
I bet a 1600 CFM carb would be right at home on a 580 inch motor.
I bet it could use two carbs even better!!
Of course, having a proper airflow / vacuum gauge to tell you whats going on, would be ideal. If for example you are seeing over a .5" of vacuum at WOT at peak RPM's, you should increase the CFM by 100 for every additional .5" of observed vacuum, because excessive vacuum = restriction.

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Re: carb size?

Post  bbfstanger on November 18th 2016, 11:53 pm

2.125 butterflies Lem, I was wrong its rated at 1300cfm by pro systems.



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