Rochester 2GC info

[Bench Racer]

Originally Posted by Mark Yacavone

Even the 69 Impala 396/265 used the 1.25 carb, strange as that sounds.

Yeah I noticed the early 400 Chevy and 396 used the smaller carb. From what I could find the 400 and 396 carb was around 12 or so CFM less than the 1969 and I think 1970 model 350's. Wonder how much the difference in CFM was worth?

[NORMAN BARNARD]

How many of the 1.375 venturi's do you need? I think i have a couple
in the shed. Also venturi clusters and baseplates left over from the local circle track racers who now are allowed to run holley 4412's.

Now is it true or false, nhra no longer is enforcing the carb. P/number but as long as it meet's dimensional configuration and " original visual design" it's good...... (notice i said original design ).
So with that being said and "untouched rochesters" being harder to find. Why can't the marine carb. (that meets the above specification) be used??? Easier to find (yes, even in the darn) desert and has all the good parts already installed (ok, maybe not all, but it has the "good booster cluster" and comes very darn close on the "fuel curve" needed.

Norm

[Mike Jones]

Originally Posted by NORMAN BARNARD

How many of the 1.375 venturi's do you need? I think i have a couple
in the shed. Also venturi clusters and baseplates left over from the local circle track racers who now are allowed to run holley 4412's.

Now is it true or false, nhra no longer is enforcing the carb. P/number but as long as it meet's dimensional configuration and " original visual design" it's good...... (notice i said original design ).
So with that being said and "untouched rochesters" being harder to find. Why can't the marine carb. (that meets the above specification) be used??? Easier to find (yes, even in the darn) desert and has all the good parts already installed (ok, maybe not all, but it has the "good booster cluster" and comes very darn close on the "fuel curve" needed.

Norm

You have a PM


Mike A114
P/SA

[Jeff Stout]

I may be interested in 2 of these carbs. New dirt track rules from imca and they are quoting the 1.375 carb as being the 1 to use. Price for 2 complete shipped to 85013 if interested in selling.

QUOTE=NORMAN BARNARD;482788]How many of the 1.375 venturi's do you need? I think i have a couple
in the shed. Also venturi clusters and baseplates left over from the local circle track racers who now are allowed to run holley 4412's.

Now is it true or false, nhra no longer is enforcing the carb. P/number but as long as it meet's dimensional configuration and " original visual design" it's good...... (notice i said original design ).
So with that being said and "untouched rochesters" being harder to find. Why can't the marine carb. (that meets the above specification) be used??? Easier to find (yes, even in the darn) desert and has all the good parts already installed (ok, maybe not all, but it has the "good booster cluster" and comes very darn close on the "fuel curve" needed.

Norm[/QUOTE]

[Lyn Smith]

Jeff, sent you a pm on some of the bigger 2bls.

[Run to Rund]

I to am interested in the 1.375" venturi carbs. Thanks.

[NORMAN BARNARD]

While researching some other carb's today i ran across the following. Carb's 7042118 and 7042838 (large 1.375 venturi's) were installed on all models of that year with the 400 motor.

Document used was the napa carburetor application and parts guide......then checked the nhra eng. Spec. Sheet and found 1.250
venturi listed..maybe typo???/ these carb's have never been machined as the parting line(s) in the venturi are still there....

Any suggestions?????

[Mark Yacavone]

Here's another one:
The 1969 full size Chevy 327 /235 used some form of the big base carb.
The 327 /210 used the small 1.09 carb .
That is the difference between the two engine options..
Yet the NHRA specs list both using the same (small ) carb and manifold.

[Mike Jones]

Originally Posted by Bench Racer

Yeah I noticed the early 400 Chevy and 396 used the smaller carb. From what I could find the 400 and 396 carb was around 12 or so CFM less than the 1969 and I think 1970 model 350's. Wonder how much the difference in CFM was worth?

I was told the difference between the big
and small carb is about .5



Mike A114
P/SA