Need help with Carb ID

nh8260 · Jul 19, 2018

I found these two carbs at my great uncles house and was wondering what they go on, one on the left says General Motors and didn't see anything on the other one. Someone would probably like to buy these for a classic car or truck. I'm just looking for any info about them and what a fair price would be.

nh8260 · Jul 19, 2018

Another couple pictures

LarrySTN · Jul 19, 2018

I think Chevy Chevette.

Steve@Advance · Jul 19, 2018

I'm going with inline 4 or 6 Chevrolet, other GM products in the 63-75 year range.

If there is a tag the number would narrow it down.

Mule Meat · Jul 19, 2018

GM 235 or 261 Six cylinder truck engine.

JMOR · Jul 19, 2018

My , 1962 as from factory, 235 is manual choke. When did they start automatic choke?

Dusty MI · Jul 19, 2018

(quoted from post at 08:19:54 07/19/18) My , 1962 as from factory, 235 is manual choke. When did they start automatic choke?

I had a '66 Ford Custom straight 6 with 3 speed stick. It had an auto choke.
A cold winter wind would close the choke even though the engine was warm and didn't need the choke.

Dusty

Steve@Advance · Jul 19, 2018

My aunt had a 53 Chevy with auto choke.

The interweb says they have been around since the '30s. But her's was the first I remember actually seeing and working on. I remember questioning if that was the original carb, and was assured it was.

T.R.K. · Jul 19, 2018

I second that, at least for the one with the automatic choke.

Steve@Advance · Jul 19, 2018

I'm thinking later than the stove bolt engines.

If I recall, the stove bolt had a 1/8" NTP threaded fuel connection.

The next generation went to the spring loaded bronze filter inside the top cover, later to a paper cartridge.

Mule Meat · Jul 19, 2018

(quoted from post at 08:19:54 07/19/18) My , 1962 as from factory, 235 is manual choke. When did they start automatic choke?

I am not sure when the electric choke was added. GM's Inline 6 production ran from around 1929 with the first generation and ended around 1988 or 1990 with the Third generation..

I have saw them with different choke setups over the years. Some even had a coiled spring (like an old mercury switch for a house thermostat) with a tube that ran to the head through a chamber and back to the carb. As the engine warmed the warm air would pass through a chamber by vacuum and heat the spring to open the choke.

If you look close at the first photo. It appears as if it may have had the vacuum setup. The fitting on the bottom would be where the tube to the head would connect.

Bob · Jul 19, 2018

Here 'ya go...

"The Rochester model B carburetor was used on GM 4 and 6 cylinder General Motors engines from 1950 to 1967. The carburetor has three varieties (B, BC, BV) depending on the choke.
B - Manual choke
BC - Choke thermostat mounted on carburetor.
BV - Divorced choke thermostat mounted on intake manifold."

Mule Meat · Jul 20, 2018

(quoted from post at 21:44:25 07/19/18) Here 'ya go...

"The Rochester model B carburetor was used on GM 4 and 6 cylinder General Motors engines from 1950 to 1967. The carburetor has three varieties (B, BC, BV) depending on the choke.
B - Manual choke
BC - Choke thermostat mounted on carburetor.
BV - Divorced choke thermostat mounted on intake manifold."

Thanks Bob.

I could not remember the code letters. The second photo down is a BC and the one I tried to describe. The BV as I remember was the one that had the small vacuum chamber attached to the carb and had a short rod attached to the choke plate lever. I have saw a lot of them that had failed and the owner removed the chamber, Plugged the vacuum line at the intake manifold and then attach a manual operated cable to the choke plate lever. If I am not mistaken some auto parts stores offered a kit for converting them to a manual choke back in the day. Many carbs for all types of automobiles back in the day had the BV type setup just before the electric choke became the norm.

Need help with Carb ID

nh8260

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JMOR

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