Rochester 2GC info

Mark Yacavone · 09-28-2015, 11:49 PM

Mike, How high are you foot braking it?

MikeMoller · 09-29-2015, 12:25 AM

Bad air 3000, good air 3500. By the way, just installed Kenny's converter today. With the old converter, 3500 was really wanting to push the brakes. Car was .04-.06 slower at 2500.

Mark Yacavone · 09-29-2015, 12:30 AM

I don't think you need to worry about a power valve then.
As long as it drives around the pits okay...

MikeMoller · 09-29-2015, 12:37 AM

No issue in the pits. Thanks. Will know this weekend if the converter helps- it should be a little looser.

NORMAN BARNARD · 09-29-2015, 12:27 AM

Mike, you'll go nut's trying to use a pv in a roch. 2gc carb as they had so many deravations of the pvrc they used.. Plug it, retap the jetting holes and use the holley jetting, better selection and easily obtainable. Tip:, now your ready to begin playing with the fuel curve !!!!!!! (assuming you have a good wide band data logger).

Ed Wright · 09-29-2015, 09:43 AM

Quote:

Originally Posted by NORMAN BARNARD

Mike, you'll go nut's trying to use a pv in a roch. 2gc carb as they had so many deravations of the pvrc they used.. Plug it, retap the jetting holes and use the holley jetting, better selection and easily obtainable. Tip:, now your ready to begin playing with the fuel curve !!!!!!! (assuming you have a good wide band data logger).

We used to do that to the old 4GCs. We were told then that we could not remove & plug it. Many of us pulled the piston/spring, pushed the piston up, and put a ding in the rod with a pair of dykes so it could not extend again, and jetted up. Easy to find Rochester jets back then.

MikeMoller · 09-29-2015, 12:12 PM

Found a good source of 2GC part including jets-Mike's Carburetor Parts. Has everything for 2GC's.

http://www.carburetor-parts.com/Rochester_c_31.html

John Beasaw III · 09-30-2015, 12:11 AM

Does anyone run a 2gc combo in super stock? I was looking at it as an option for both stock and super stock, I just have no clue where to start looking for info on how to make a 2gc work in either configuration.

I would be N/SA or SS/MA, in my 70 chevelle.

Hate the off season, ideas run rampant. Lol...

NORMAN BARNARD · 09-30-2015, 12:34 AM

John, there's plent of guy's on here that will share the info. With you. You didn't say what the engine spec's were!!!!

I see where your from upstate new york just east of rochester.
I'm also from upstate called batavia, about half way between
rochester and buffalo .

If i can be of help, just send me a pm......good luck.....norm

MikeMoller · 09-30-2015, 10:42 AM

I'm no expert, but I found this interesting link for 2GC info - Hot Rod Magazine article

http://www.hotrod.com/how-to/engine/...g-carburetors/

09-28-2015, 11:49 PM	#1
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,833 Likes: 2,928 Liked 5,147 Times in 1,964 Posts	Re: Rochester 2GC info Mike, How high are you foot braking it? __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers

09-29-2015, 12:25 AM	#2
MikeMoller Senior Member Join Date: May 2010 Location: Raleigh NC Posts: 637 Likes: 27 Liked 254 Times in 78 Posts	Re: Rochester 2GC info Bad air 3000, good air 3500. By the way, just installed Kenny's converter today. With the old converter, 3500 was really wanting to push the brakes. Car was .04-.06 slower at 2500. __________________ Mike Moller NHRA 203 Q-R-T/SA Last edited by MikeMoller; 09-29-2015 at 12:29 AM.

09-29-2015, 12:30 AM	#3
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,833 Likes: 2,928 Liked 5,147 Times in 1,964 Posts	Re: Rochester 2GC info I don't think you need to worry about a power valve then. As long as it drives around the pits okay... __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers

09-29-2015, 12:37 AM	#4
MikeMoller Senior Member Join Date: May 2010 Location: Raleigh NC Posts: 637 Likes: 27 Liked 254 Times in 78 Posts	Re: Rochester 2GC info No issue in the pits. Thanks. Will know this weekend if the converter helps- it should be a little looser. __________________ Mike Moller NHRA 203 Q-R-T/SA

09-29-2015, 12:27 AM	#5
NORMAN BARNARD Member Join Date: Mar 2006 Location: EL PASO, TEXAS Posts: 156 Likes: 0 Liked 2 Times in 2 Posts	Re: Rochester 2GC info Mike, you'll go nut's trying to use a pv in a roch. 2gc carb as they had so many deravations of the pvrc they used.. Plug it, retap the jetting holes and use the holley jetting, better selection and easily obtainable. Tip:, now your ready to begin playing with the fuel curve !!!!!!! (assuming you have a good wide band data logger).

09-29-2015, 12:12 PM	#7
MikeMoller Senior Member Join Date: May 2010 Location: Raleigh NC Posts: 637 Likes: 27 Liked 254 Times in 78 Posts	Re: Rochester 2GC info Found a good source of 2GC part including jets-Mike's Carburetor Parts. Has everything for 2GC's. http://www.carburetor-parts.com/Rochester_c_31.html __________________ Mike Moller NHRA 203 Q-R-T/SA

09-30-2015, 12:11 AM	#8
John Beasaw III Member Join Date: Jan 2002 Location: Marion, N.Y. Posts: 126 Likes: 0 Liked 2 Times in 2 Posts	Re: Rochester 2GC info Does anyone run a 2gc combo in super stock? I was looking at it as an option for both stock and super stock, I just have no clue where to start looking for info on how to make a 2gc work in either configuration. I would be N/SA or SS/MA, in my 70 chevelle. Hate the off season, ideas run rampant. Lol...

09-30-2015, 12:34 AM	#9
NORMAN BARNARD Member Join Date: Mar 2006 Location: EL PASO, TEXAS Posts: 156 Likes: 0 Liked 2 Times in 2 Posts	Re: Rochester 2GC info John, there's plent of guy's on here that will share the info. With you. You didn't say what the engine spec's were!!!! I see where your from upstate new york just east of rochester. I'm also from upstate called batavia, about half way between rochester and buffalo . If i can be of help, just send me a pm......good luck.....norm

09-30-2015, 10:42 AM	#10
MikeMoller Senior Member Join Date: May 2010 Location: Raleigh NC Posts: 637 Likes: 27 Liked 254 Times in 78 Posts	Re: Rochester 2GC info I'm no expert, but I found this interesting link for 2GC info - Hot Rod Magazine article http://www.hotrod.com/how-to/engine/...g-carburetors/ __________________ Mike Moller NHRA 203 Q-R-T/SA Last edited by MikeMoller; 09-30-2015 at 10:48 AM.

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