Visit The Dirt Forum for More Information

Author Topic:   Two-Barrels
posted March 12, 2000 05:12 PM
The holley two barrels are a popular choice by far in this class I think, but what other types of two barrels are being used, are there any performance advantages with these also?

posted March 14, 2000 03:38 PM
some are running a different two barrel, not sure what kind it is, but it runs good.

posted March 15, 2000 08:28 AM
Hi, perhaps this will stimulate conversation...

In the midwest, IMCA allows the use of Motorcraft 2bbl carbs on Chevy engines, with the use of an adapter (they have a Holley 2bbl bolt pattern).

In other regions, Rochester 2G carbs (both stock and highly modified) are the norm.

In yet other places, teams are having success with the Holley 2bbl that has annular discharge venturi's - this carb is a 600cfm carb out of the box.

Others still, make use of "hybrid" 2bbl carbs that are made by bolting the baseplate from a Chevy 2G Rochester to the body of the early '70's 2G Rochester off a 455 Pontiac or Buick.

Depending on rules, some classes are allowed to get really radical and use the Predator carbs. Those rulebooks, being poorly written and specified, only call for something like "a single, one or two barrel carb"....

Hope this helps. Any other questions, feel free to email me or reply.


posted March 20, 2000 10:46 PM
Please enlighten me on the subject of "the Holley 2bbl that has annular discharge venturi's - this carb is a 600cfm carb out of the box."

posted March 21, 2000 08:21 AM
I have one sitting in the shop on the bench. Off the top of my head, I can't remember the exact Holley model number on it (it starts with a 6, though). I'll look it up tonight and reply back. They are a hard-to-find piece these days, BTW....The noticeable thing about them is that they don't have the traditional boosters sticking out across the venturi's...the venturis are actually "sleeves" with holes around their perimeter that perform the function that boosters would (annular discharge).

Hope that helps,


Back to the Archives