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71
Quadrajet Carb Talk and Tips / Re: HEI Distributor mechanical advance curve options
« Last post by Cadman-iac on March 18, 2026, 11:57:37 AM »
Quote from: Burd on March 16, 2026, 03:29:08 PM
I had mine put in a sun machine, that’s the best way.

 Yeah,  I'd love to go that route, but unfortunately I don't have access to one or know of anyone that's got one.
 If I found a shop with one, they'd probably charge a fortune for what I'm trying to do.
   But I'm mainly trying to figure out what each combination would provide as far as the maximum mechanical advance, as far as the curve goes, I can figure that out on the engine, and can change springs to fine tune it.
  Im trying to get my timing into the optimum range for both power and mileage, especially since this freaking idiot has started another war and gas isn't going to get any cheaper anytime soon.

 Rick
72
Quadrajet Carb Talk and Tips / Re: Bigger holes in Main body and Air Horn than First Recipe recommendation.
« Last post by Kenth on March 18, 2026, 02:39:34 AM »
You may open the idle channels to .046".
The upper idle air bleeds, .069 are located in the float bowl (not in the air horn) and is on par with Cliff´s rcommendation.
The accelerator pump discharge jets, .026" are located further in thru the outer .060" siphon hole.
The .040" secondary POE well restriction is fine.
The secondary POE discharge jets, .030", are located further in thru the .053" holes. Needs to be opened.
Doesn´t hurt to increase the secondary air valves opening angle.
If you are using an electric choke element and plug the hot air channel, you may want to add some idle bypass air in the throttle plate, .070"-.080" for each bore will do.

HTH

73
Quadrajet Carb Talk and Tips / Bigger holes in Main body and Air Horn than First Recipe recommendation.
« Last post by Albert on March 17, 2026, 04:59:32 PM »
Hi All.
I hope I posted this in the correct place.
I bought Cliff's service kit. His advice, and reading on the forum here has been a God-send!
I have measured all hole sizes in the body and air horn of my current (and first) attempt to restore a this Quadrajet which will go on to a stock standard AMC 304 V8.

Do I need to reduce some holes sizes to suit the 304? The holes in the castings, are larger than what Cliffs First Recipe recommends.

Particularly: Idle channel hole, Upper Idle Air bleed, Accelerator Pump discharge holes, Secondary POE Well restriction, and should I reduce the Secondary Air Flap Opening Distance.

I have highlighted these items in red on the document that I will try to attach below, and a couple of photos of where I am at for now.
First column next to descriptor is my Carby, to the Right is Cliffs recommended First recipe for comparison.

Would it be OK to pop it onto the engine and try run & tune it or will these specs just not work?
I look forward to hearing your thoughts.
Many thanks.


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Quadrajet Carb Talk and Tips / Re: Tab in Sec Flap
« Last post by lightning boy on March 17, 2026, 01:02:05 PM »
Makes sense Cadman, I thought it would be for distribution for a particular manifold. Hopefully Cliff will chime in.
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Quadrajet Carb Talk and Tips / Re: HEI Distributor mechanical advance curve options
« Last post by DJD OLDS 4MC on March 16, 2026, 04:37:50 PM »
All HEI except Oldsmobile - center plate numbers and fly weight numbers face up.

Olds HEI - center plate numbers and fly weight numbers face down.

According to Dick Paterson @ Springfield Ignition, Orillia Ontario Canada
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Quadrajet Carb Talk and Tips / Re: HEI Distributor mechanical advance curve options
« Last post by Burd on March 16, 2026, 03:29:08 PM »
I had mine put in a sun machine, that’s the best way. 
77
Quadrajet Carb Talk and Tips / Re: HEI Distributor mechanical advance curve options
« Last post by novadude on March 16, 2026, 10:34:12 AM »
Sounds like interesting data.
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Quadrajet Carb Talk and Tips / Re: Secondary metering rod oddity
« Last post by novadude on March 16, 2026, 10:33:14 AM »
So I'm not crazy and they do exist!  haha
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Quadrajet Carb Talk and Tips / Re: 1969 GMC 2500 Quadrajet Carburetor
« Last post by novadude on March 16, 2026, 10:32:42 AM »
I would be tempted to keep the 7029207.  Those have a nice calibration from the factory, and it is likely the service replacement number GM sold for your truck in 1977.
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Quadrajet Parts and Numbers / Re: 4M Power Piston Spring
« Last post by ourkid2000 on March 15, 2026, 05:38:27 PM »
Thanks! Helpful as always Kenth!

So if I wanted to replace my stock 7029922 with a nice new one from Cliff's kits, what would be the one to go with that matches closest? Looks like he sells a kit of 4, the blue one would be the same possibly?
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