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Author Topic:   rochester 2bbl.
#23
Member
posted November 30, 2002 01:50 AM
The rules at the track I race at have changed, We are changing from 4bbls to 2bbls, my question is what is the best/biggest rochester 2bbl out there?


KPLugnut
Member
posted November 30, 2002 09:59 AM
Are your rules specifying that you can't alter the carbs? Or is it a "stock appearing" type thing where as long as the carb starts out as a Rochester 2G then anything else goes? If that is the case, then there are modified 2bbls available that breathe a LOT more than any stock 1 3/8" carb.
But if your tech requires the carbs to be "stock", then the biggest Rochester 2bbl ever made was 1 3/8" venturi diameter and 1.687" throttle bore. Almost all the common 2G's had that same throttle bore diameter, but there were about 4 or 5 different diameter venturi, the most common ones being either 1 1/4" or 1 5/16" which is what you'll almost always find on the late 60's, early and mid 70's Chevy cars and trucks. One of the few passenger cars that came with the really rare 1 3/8" venturi 450cfm carb was the 1971 Pontiacs with 455ci motors.
Grain trucks, OLD GMC school buses, and other such industrial applications also had those carb bodies with the big bore venturi. It's very hard to find them anymore, tho.

If you need help finding one, or would like one built, just give me a shout.

Dayton Umholtz, owner
Kinetic Performance


tilley88
Member
posted November 30, 2002 11:12 AM
Dayton, what would ya charge to go thru and modify my core? I've got one of the bigger ones.


#23
Member
posted November 30, 2002 02:38 PM
KPLUGNUT--THE RULES SAY STOCK APPEARING, THE CHOCK PLATE CAN BE REMOVED. IF YOU HAVE ANY NUMBERS FOR THE LARGER 2G'S COULD YOU LIST THEM? THANKS FOR YOR HELP.


KPLugnut
Member
posted November 30, 2002 02:53 PM
$150 from a customer core. We prefer not to use the rare large bore bodies when creating our "outlaw style" 2G's, tho, but a fully blueprinted large bore will out-perform any stock large bore 2G out there.

#23, look for carbs with the last 3 digits of 118, 107, or 162, just for starters. Some others were also done as 1 3/8" bores as well, so really the best foolproof way is to measure the venturi diameter with the booster assemblies removed, or by making a bore guage with the center cut out (like an upside down tuning fork).

Hope that helps,
Dayton.


#23
Member
posted November 30, 2002 03:25 PM
DAYTON, WHERE ARE LOCATED AT? IF YOU CAN PERFORM A LITTLE MAGIC ON A CARB I ALREADY HAVE THAT MIGHT BE THE WAY TO GO. LET ME KNOW. TRENT.




KPLugnut
Member
posted November 30, 2002 06:42 PM
We're located in Ithaca, NY, but we ship nationwide all the time. And if turnaround time during the season is an issue, rest assured, we can have a carb back in the same week in rush cases.

Feel free to check our website for more info:
www.kineticperformance.net
(or just click on our scrolling banner above)

Our shop address is:

Kinetic Performance
373 Van Dorn Rd. N.
Ithaca, NY 14850

Phone: 607-277-6462
(we're usually here evenings and weekends. If you get the machine, leave a message and I'll call you back).

Looking forward to hearing from you.

Dayton Umholtz, owner
Kinetic Performance


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