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Old 01-07-2012, 11:57 AM
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Any info on this Carb?

Question on this carb. It came off a 75 Monte Carlo SBC400 stock. All I'm finding on it is Rochester Quadrajet. Does anyone know the model or anything else about this? I'm going to be selling it and need to know more before I do. Thanks a lot!
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Old 01-07-2012, 03:45 PM
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Look up the carb number. Location shown w/red arrow, below.

Info that is pertinent to someone wanting to buy would be the year, AT or manual linkage, divorced, hot air or electric choke, any missing/broken parts or stripped threads, and show good photos of various views.
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Old 01-08-2012, 09:21 AM
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Quote:
Originally Posted by cobalt327
Look up the carb number. Location shown w/red arrow, below.

Info that is pertinent to someone wanting to buy would be the year, AT or manual linkage, divorced, hot air or electric choke, any missing/broken parts or stripped threads, and show good photos of various views.
Roger that. Will look it up and get all that info together.
What is divorced?
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Old 01-08-2012, 12:50 PM
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It's a spreadbore carb, meaning the secondaries are bigger than the primaries. You need a spreadbore manifold for this carb to work, or an adapter plate?
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Old 01-08-2012, 06:03 PM
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Quote:
Originally Posted by david-b
Roger that. Will look it up and get all that info together.
What is divorced?
A divorced choke has the bimetal thermostat mounted on the intake w/a link to the choke mechanism on the carb. Your carb has a "hot air" type choke (round black part on the side of the carb) that has heated air piped from the exhaust crossover of the intake to the choke housing that contains the bimetal thermostat.

Your carb will almost assuredly have a provision for the tranny detent cable. Another thing that is often asked is the type of fuel inlet it has- "straight" or "side". Yours has the side fuel inlet, as does most Chevy Q-jet carbs.
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Old 01-09-2012, 01:03 PM
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Quote:
Originally Posted by cobalt327
A divorced choke has the bimetal thermostat mounted on the intake w/a link to the choke mechanism on the carb. Your carb has a "hot air" type choke (round black part on the side of the carb) that has heated air piped from the exhaust crossover of the intake to the choke housing that contains the bimetal thermostat.

Your carb will almost assuredly have a provision for the tranny detent cable. Another thing that is often asked is the type of fuel inlet it has- "straight" or "side". Yours has the side fuel inlet, as does most Chevy Q-jet carbs.
Thank you for the info.

This carb shouldn't have a detent provising. The kickdown cable from the trans goes directly to the gas pedal.

This carb came with my car along with 2 others (Edelbrach and a Demon) so no reason for it to still be here collecting more dust.
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Old 01-09-2012, 02:08 PM
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Quote:
Originally Posted by david-b
Thank you for the info.

This carb shouldn't have a detent provising. The kickdown cable from the trans goes directly to the gas pedal.

This carb came with my car along with 2 others (Edelbrach and a Demon) so no reason for it to still be here collecting more dust.
I just learned something- I had thought a '75 M/C would have had a kickdown hooked to the carb. I know there were several GM makes (Pont., Olds and Buick) that used the throttle pedal kick down in the '70's, but didn't know Chevy used it.

It doesn't look like there's a peg for the detent, but it wouldn't surprise me too much if there were. There are original manual trans Q-jets that still have the detent pin on the throttle arm of the carb- just depends on what was used at the time, I guess.

Thanks.
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Old 01-09-2012, 05:42 PM
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That is a hot air Choke and it has a vacuum pull off which normally is used with the automatic tranny. I had a 74 MC with a SB400 and same set up except it had a kick down cable hooked to the Carb linkage. It had a TH400 and air conditioning.

Trees
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Old 01-09-2012, 06:29 PM
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Quote:
Originally Posted by trees
That is a hot air Choke and it has a vacuum pull off which normally is used with the automatic tranny. I had a 74 MC with a SB400 and same set up except it had a kick down cable hooked to the Carb linkage. It had a TH400 and air conditioning.

Trees
I worked on a '77 Monte for a friend many times, and owned a '79- both used the carb mounted kick down, too. The 400 used a different set up than the TH350, but I thought they were all pretty much carb mounted- even the TH400 switch. But there again, some GM's w/TH400 had a throttle pedal mounted switch arrangement, IIRC.
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Old 01-10-2012, 08:17 AM
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When I was originally doing some research on this setup, it sounds like it's very rare to have the kickdown directly on the pedal instead of the carb.

This car stock was a SBC400, A/T TH350, with AC, cruise control. Also has the rare swivel seats
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