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Author Topic:   running 2brl carbs?
posted October 14, 2003 12:24 PM
I am going to be building a limited late model motor and where I run I am restricted to a 500cfm 2brl. I am trying to find information on which manifold would make more overall power.

I can either run a 4 brl manifold with a 2 brl adapter Or A 2 brl manifold.

Has anyone tried both or what is your experiance with a 2 brl.

I am thinking that with the 4 brl manifold it would have good top end power however throttle response would suffer due to the increased plenum area.

Thanks Chris

posted October 14, 2003 02:41 PM
It all really depends on WHAT 2bbl intake you're talking about. If you can run aluminum, such as the Edelbrock Victor 2V intake, then run that with only a 1" phenolic tapered spacer.
If you're restricted to only cast iron OEM style intakes, then run an older style quadrajet intake with the plenum area milled and a 1" slider phenolic spacer. You didn't say if there were rules as to what spacer you can run, so if there aren't, go with a 2" spacer.
There are Marine intakes as well that work well in cast iron.
A lot of your choices are going to revolve around both the rest of the motor combination as well as your track length and rpm ranges, too.
And your choices become something entirely different if running Vortec heads, too.

Long tracks require a different "animal" than a short 1/4mile bullring does so even the cam choice is going to vary depending.

Generally, the very large open plenum intakes such as Super Victors are going to be meant more for longer tracks with sustained higher rpm laps than the smaller volume intakes.

Hope that helps, and if there's anything we can help with, let us know. We've got iron intakes as well as can supply aluminum, too, not to mention carbs....

Dayton Umholtz, co-owner
Kinetic Performance

GO 24
posted October 15, 2003 01:29 PM
Our limited class also has to run the 4412 2bbl's and were restricted to the Edelbrock Torker 2 or the Performer, most go with the Torker 2 and it's range is pretty decent upto about 7000rpms or so and then tales off---of course your cam choice plays a major part.

posted October 16, 2003 09:20 AM
In my class I can run any manifold with a 1" spacer limit.The track is on a high banked 3/8 mile.

The Victor 2V is what I have been looking at.

Thanks Chris

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