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Quadrajet Carb Talk and Tips / Re: Secondary hanger and rods?
« Last post by Jeff K on Today at 10:48:10 AM »
Hi Cliff, I'm ready for a carb tune up. I think the acc. Pump is starting to go. I'm getting a stumble when pulling out. Other than that it runs real strong. That 22216 cam really work this 454 up. I can send everything needed in the mail if you like...
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Quadrajet Carb Talk and Tips / Re: Edelbrock Q-jet
« Last post by Mudsport96 on Today at 03:15:35 AM »
I have a 1901 unit I used to run on my 350. Couldn't ever get it to idle worth a damn but ran good at higher throttle angles and wide open. Turned out to have a worn throttle shaft bore... brand new. So I shelved it for the rebuilt stock one I use now. I think if I was to use bushings to fix the vacuum leak at the shaft it would be a great carb, but that is currently lower on my list of things.
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Quadrajet Carb Talk and Tips / Edelbrock Q-jet
« Last post by 68rs/ss on May 10, 2025, 06:02:40 PM »
Reading Cliff's book, it has a section there about the Edelebrock Q-jets. Most of the discussion there is about the RPM Q-jet, with a recipe and other features of this high performance unit. I know there were other replacement carbs available from Edelbrock, but there is little info on those replacement units. Are those desirable and good candidates for a hotrod with proper rebuilding and modifications? I am guessing Cliff's parts would work on those?
Thanks for any replies.
Phil
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Lobby / Re: Cory Oliver Buice epic? 428 Pontiac Build, HP guesses? Critique welcome
« Last post by lightning boy on May 09, 2025, 12:36:01 PM »
580Hp at 6200
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Dialing in your rebuilt Quadrajet carburetor / Re: Timing adjustments
« Last post by ourkid2000 on May 05, 2025, 03:37:33 AM »
Ah yes, forgot to mention that one. I did actually go up one size on the main jet from the stock jets. Running a 73 rather than a 72.
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Dialing in your rebuilt Quadrajet carburetor / Re: Timing adjustments
« Last post by tayto on May 04, 2025, 12:48:43 PM »
you might need to go up 1 main jet size and readjust idle mixture as the ethanol blended fuel will Want slightly richer mixture than "real" gas
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Dialing in your rebuilt Quadrajet carburetor / Timing adjustments
« Last post by ourkid2000 on May 04, 2025, 12:02:49 PM »
I've learned not to trust everything I read online when it comes to dialing in these old engines, but the general consensus I've noticed is that just about everyone mentions that with the fuels of today you'll most likely need to bump up the initial timing just a touch on a stock original engine.

How do you guys feel about this? Is it hogwash? The original spec on my '66 Toro is 7 deg BTDC, but that would be with the fuels of the period however, and I did notice it runs quite a bit better with it bumped up to about 10 (stock, never rebuilt engine).

I did check the timing marks on the balancer to make sure it hadn't slipped on the pulley and it's definitely right on the money.
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Quadrajet Carb Talk and Tips / Re: Early non APT primary rod set up.
« Last post by Pav8427 on May 01, 2025, 07:29:41 AM »
Thats a new one on me. Would assume that would work for any non APT early units.
Will keep that one in my toolbox as I move forward.

Thanks. Doug
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Quadrajet Carb Talk and Tips / Re: Early non APT primary rod set up.
« Last post by mcx on May 01, 2025, 03:34:34 AM »
Those early Pontiacs don’t have any APT feature to adjust the primary rods depth in their jets …so purchase some washers and install one at a time inside the power piston and spring assembly…it will slightly lift the  primary rods just like a real APT screw…swap out your original primary rods for a set of “B” stamped rods…The “B” have a taper so they have a adjustment range to take advantage of. Only small disadvantage is you have to be careful removing the air lid each time to try an additional washer, though it’s pretty easy stuff on the early carbs.
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Quadrajet Carb Talk and Tips / Re: Early non APT primary rod set up.
« Last post by Cliff Ruggles on May 01, 2025, 02:16:56 AM »
If you are using the original style metering rods there isn't much benefit from bending the hanger arms up or down to try to fine tune part throttle A/F.  Most important is to make sure the upper section is well located in the actual orifice of the jets, and that the tips are as well when the power piston is at full height. 

Pretty common for PP hanger arms to be bent, up, down, one up, one down, etc, from previous rebuilds.

I was working on a 1980 Caddy carb yesterday that was just rebuilt and both arms were bent down quite a bit.  It was pretty obvious just looking at the PP that they were not level, but it still was assembled that way by the previous builder.....
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