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Dialing in your rebuilt Quadrajet carburetor / Re: Fine tuning Q-jet
« Last post by 77cruiser on May 25, 2022, 04:30:44 PM »
I don't know about a CR, if it's like a lot of other low perf. valve bodies it's almost impossible to get the shift points much higher.
The spool sizes are different in a hi perf valve body.
I had a OG & managed to get 6200 1-2 but 5800 2-3 & a bit under 5000 3-4.
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Dialing in your rebuilt Quadrajet carburetor / Re: Fine tuning Q-jet
« Last post by 73ss on May 25, 2022, 04:08:34 PM »
Mine did have the pink paint mark. Also had CZ stenciled on it in white.
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Quadrajet Parts and Numbers / Re: Transfer slots.
« Last post by 73ss on May 25, 2022, 04:03:46 PM »
Thanks for replies. What if you wanted to run ported vacuum for the distributor on one of these truck carbs? Did the factory run full vacuum for the distributor on these carbs? Most all of the truck carbs I come across have the full, non ported or timed vacuum port.
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Loosing power on a hard steady run also indicates a fuel delivery or fuel control issue with the float/needle/seat assembly.  This assumes the fuel filter is installed correctly and not plugged up.....
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Also, I haven't had the chance to check fuel pressure yet.  But, I did run the boat last weekend and it had the same symptoms after slowing down from a long-ish run.  Also it did something new that I haven't experienced before - as we were running the boat at one point I could feel it start to loose power.  I backed the throttle down some, and it seemed to steady up, then when I tried increasing throttle, it was unresponsive.  Ultimately it just bogged itself down and died.  I let it sit for about a minute and it fired right back up, then we slowly finished our trip back to the ramp at a slower speed and it did fine.  I'm guessing it's all related, and all symptoms of the flooding.
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Cliff - I haven't tried that yet.  How should I do that - evenly on both sides, 1/4 turn at a time and see if the drip stops?  How many turns is too many?
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Quadrajet Parts and Numbers / Re: Transfer slots.
« Last post by QUADRAJAM on May 24, 2022, 12:58:43 PM »
I tried swapping a base plate once an it didnt work very well. surging idle, cant set idle etc.
It was omly slightly different. Like Cliff said the shaft swap would be the easiest way out.
Then you could go ahead and rebush the throttle shaft bores.
That 84228 carb is a nice carb too if you convert it to front pull-off. I havs several
84226 in my collection that run great. Probably very similar. Good Luck.
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Dialing in your rebuilt Quadrajet carburetor / Re: Fine tuning Q-jet
« Last post by von on May 24, 2022, 05:11:33 AM »
Von, well that makes things more complicated. All of the posts I've read about the 1986 monte say the CR vb is made with the same basic core vb used in the CZ. The CR vb can be made to perform like the CZ with minor mods like changing shift springs, line pressure and the governor to the CZ piece. The govenor mods you made should have result in some rpm increases.

What's confusing is that performance vbs in 1986 monte were marked by GM with pink paint and you say yours was not. Now I wonder if the changes I planned to mine will be worth it.
Mine could have pink paint on the VB, just maybe not visible in the photo I have. Mine has the Transgo shift kit in it so it has stiffer springs, etc. The gov mods did increase WOT shift rpm but just not quite high enough IMO. Maybe just needs more gov lightening. Since my stock 350 is all done about 4600 or so anyway it's not real far off. I don't feel like pulling the pan again anytime soon so it will do for now. I don't race it and don't go WOT that much.
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Quadrajet Parts and Numbers / Re: Transfer slots.
« Last post by Cliff Ruggles on May 24, 2022, 02:29:36 AM »
It is ALWAYS best to keep the three parts from any Quadrajet together vs swapping in a part from another unit.  The transfer slots can not only vary in length they can vary in location.  They are a key player in off idle smoothness and transition to the main system.  I would for sure swap out the throttle shafts vs the complete baseplate........
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Quadrajet Parts and Numbers / Re: Transfer slots.
« Last post by Kenth on May 24, 2022, 12:41:50 AM »
The only thing i´ve noticed with the longer slots is i don´t need the mixture screws out as far as they need to be with the shorter slots.
On the other hand, you can always swap the throttle shafts.
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