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Quadrajet Carb Talk and Tips / Re: Quadrajet and C6 Ford Trans.
« Last post by mcx on May 21, 2020, 06:36:28 AM »
Thanks Cliff...what are ya  thoughts on Lokar universal flex cables for this sort of application?  Would the typical late 70s GM quadrajet turbo 350 pivot arm be made to work properly With a C6 ?  Most  seem to say, forget about  hooking it up and manually drop it a gear when down shifting/passing on hiway.... Thanks, Mike
Quadrajet Carb Talk and Tips / Re: Quadrajet and C6 Ford Trans.
« Last post by Cliff Ruggles on May 21, 2020, 04:34:26 AM »
The 1970-71 429 CJ engines used Q-jets and the ones for the C-6's have an arm that pivots for that purpose.

The attachment point can't be solid unless you "slot" where it hooks up, which would work for what you are doing........Cliff
Diagnose a Quadrajet carburetor problem / Re: Floppy Choke Plate
« Last post by Brett Slater on May 21, 2020, 03:27:40 AM »
Sorry for the lack of content and thanks for the reply.

After some convos with a couple of my Buick peeps, it was brought to my attention that the secondary choke pulloff is, in fact, missing. Clearly an important piece of my flappy choke blade puzzle.

How a "rebuilt" carb makes it through 2 different builders and no one catches it is beyond me. I bought this carb from a friend who had it rebuilt and I'm sure he had every intention of using the stock '70 intake/divorced choke setup.

I'm beside myself.
Quadrajet Carb Talk and Tips / Quadrajet and C6 Ford Trans.
« Last post by mcx on May 21, 2020, 02:52:07 AM »
Anyone, have any tips/suggestions on adapting a Quadrajet to a Ford Mustang 1972 with a 351 Clev and C6 automatic?   My brother has a Holley on it , it has the downshift rod/cable attached to the top of the throttle pivot arm.
Diagnose a Quadrajet carburetor problem / Re: Floppy Choke Plate
« Last post by Kenth on May 21, 2020, 12:46:27 AM »
Chevy OEM bimetal pushes the choke blade open. and Buick OEM bimetal pulls the choke blade open.
Using the Chevy style bimetal on intake takes the whole Chevy mechanism on carb too for proper choke action.
It would help to see the choke side of carb.

Anyhow you may adjust the choke rod to choke valve?
With choke closed (cold engine) place cam follower on second step on fast idle cam and hold against highest step.
Gauge between lower edge of choke blade and air horn wall.
Bend rod to adjust.
With Chevy style choke mechanism on carb .100" and with Buick choke .130".
Diagnose a Quadrajet carburetor problem / Floppy Choke Plate
« Last post by Brett Slater on May 20, 2020, 01:48:23 PM »
Hey folks,

I've been lurking around for a while and figured I'd see if anyone could offer any insight on my choke issue.

The carb is a '73 800 cfm Buick Q-Jet that was rebuilt by Quadrajet Power back in late 2016 and then basically redone again in 2018 by Everyday Performance. It utilizes a divorced choke and because I'm using an aftermarket intake, I had to kind of wing it and use an OEM Chevy thermostat spring, etc.

I installed the new motor a month ago and ended up having to tie off the choke plate because it was closing under acceleration. In turn, that caused terribly hard starting, so I set it back up correctly today and it fired right up, immediately going to high idle.

Once warmed up, I went for a test drive and it felt super responsive. Probably more than it has the entire time I've used it. As an aside, a subsequent test drive with the factory ram air air cleaner on seemed to make it run like it was previously - lagging and blubbering. That's another story I guess I'll have to deal with later.

When the drive was over, I noticed the choke flap was floppy and not firmly held at a 90 degree angle. This is where I'm at a loss and hopefully someone can offer a tip or two in terms of choke adjustment.

Here is a video of what I'm talking about and thanks in advance!

bring piston to TDC (use dial indicator), measure from top of deck to top of piston. then add your compressed headgasket thickness to this and you have your quench measurement.

You can adjust quench with headgasket thickness or getting deck milled. the popular thing in the SBC circles is to "zero deck". machinist will mill deck so it is exactly @ top of piston, then the headgasket strictly sets your quench.
Quench needs to be tight, especially in a Pontiac build with iron heads.  I would NOT build one with more than .040" quench distance for any reason........FWIW....
That's one thing I'm not sure about. I know the heads have at least .020 milled so that should improve the quench some, correct? I am using run of the mill fel-pro 8518pt head gaskets and cannot find anything other than speculation on what the actual compressed-thickness of these gaskets are. I would prefer cometics with their tighter bore and all, but getting my engine machined for the proper RA finish is just not an option for me (and won't be for awhile).
Quadrajet Carb Talk and Tips / Re: 1974 Pontiac 7044262
« Last post by mcx on May 19, 2020, 01:35:18 PM »
Thank you for the info!
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