[19Pontiac69]

Hi,

I have a '69 Custom S conv.with a 350/TH350. From the factory it seems like it had a 2BBL Q-Jet since it has the following codes stamped:

YU code (265HP)
#47 heads
Block cast: 9790079

An earlier owner changed the intake and put on a Edelbrock 1405. The intake has the following codes: F027 / 535255
This tells me that the intake is from 1976-1977 and fitted on 350-400-455 (info from pontiacpower.net)

So my question is what 4BBL Q-jet to choose for this intake/engine? I was hoping to find a good object to rebuild, but need to know what to look for...

Joachim,
Norway

[67cruiser]

Only view on it, find a p.b.o. 1977 carb. great fulcrum design along witha great float and ease to set-up. hope it helps

[19Pontiac69]

Thanks!

I will take a look around to see what I can find

What do you mean with p.b.o?

Edit: Oh...Pontiac, Buick or Olds

[Jeff Walker]

Yes, the 76-80 carbs with the front fuel inlet are are a good one to start with...

[bignate]

My favorite Q-jets are off of '80 to '85 Chevy/GMC 1-ton trucks without specific emissions (10000lbs. brakes) 350 or 454. Dual pulloff, big primary, easily converted to elec. choke some even have elec throttle stop solenoids that I use for A/C cars.

[19Pontiac69]

Originally Posted by bignate

My favorite Q-jets are off of '80 to '85 Chevy/GMC 1-ton trucks without specific emissions (10000lbs. brakes) 350 or 454. Dual pulloff, big primary, easily converted to elec. choke some even have elec throttle stop solenoids that I use for A/C cars.

Thank you for your advice!

[Jeff Walker]

Originally Posted by bignate

My favorite Q-jets are off of '80 to '85 Chevy/GMC 1-ton trucks without specific emissions (10000lbs. brakes) 350 or 454. Dual pulloff, big primary, easily converted to elec. choke some even have elec throttle stop solenoids that I use for A/C cars.

Yes those are good carbs too. The only drawback with them is the side fuel inlet makes routing a bit more difficult. Also some of them have the rear choke pulloff control the secondary air valve. The problem with this is that they are a lot harder to do anything to adjust the opening rate of the pull off to allow the secondaries to open quicker. And most of the ones that have the rear choke pulloff controlled secondary air valve open pretty slow from factory.

If I get one if these in to work on that has the rear choke pulloff controlled secondary air valve, I usually convert over to front choke pulloff controlled secondary air valve and discard the rear one entirely.

[bignate]

The rear pulloff truck carbs have a straight vacuum tube on them and the restriction is real easy to enlarge thereby decreasing opening time. And yes the side inlet does make it a little bit harder to route fuel lines if you use a mechanicle fuel pump but not so much with elec. pumps. I also like the rear pulloff because it unloads the choke faster if you use it. And all the truck carbs I've seen have idle bypass air on them. The 454 carbs used a throttle cable bracket that bolted to the rear carb bolts, it makes for a cleaner installation I think.