A buddy of mine has a 1970 Stage 1 Qjet that he is wanting to sell and we want to make sure that we accurately represent the carb since the values can vary significantly based on details. This carb came from a real 70 GS Stage 1 some time back and was on a car and running within the last year, but I sure it could use a good freshening up. Any feedback is appreciated.
Re: Questions on 70 Stage 1 Qaudrajet TechG8 is the guy to talk to on this - he's got all the stock specs and configuration well documented
Re: Questions on 70 Stage 1 Qaudrajet Looks good so far. Are the secondary pullover enrichment holes below the air flap? That's a Stage1 tell. Can be seen in a pic from the rear, above if you can post one. Check the secondary rods..should be AU Does it have idle air bypass holes in the baseplate? These could be seen in a pic of the bottom of the baseplate. All the Stg1 carbs ive ever found did not have them, though regular 455 carbs did.
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Here is the POE hole that Ken was referring to. On most Buick Quadrajets, they are above the secondary air valve, like in this picture. Buick Stage 1 and many 4 speed Quadrajets this hole is below the air valve.
Thanks for the picture and explanation Mark! Can you (or someone else) post the same picture of a stage 1 carb so we can see the POE hole on it?
yea that's a legit 70 stg 1 carb. worth a bundle. has all the features. No idle air bypass holes in the channels off the primary bores in the baseplate. POE holes below the airflaps. The Stage1 secondary POE holes are in the same location as marks pic, just down maybe a half inch, below the air flaps' leading edge when closed. If you zoom on the pics the OP posted, tone can be made out in the pic with the air flaps open, the passenger side. I don't have a better pic to post unfortunately.
Having trouble getting pictures loaded today. Hopefully these work. This is a correct 70 Stage 1 7040246 that I will be restoring and it will be for sale.
Thanks Mark (I haven't installed the new carb yet). Do you know if a 7040245 (70 350 4-sp) also has the POE holes below the flaps?
If you are curious why these stage 1 POE exit holes are under the flaps, here you go. The Pull Over Enrichment (POE), works like an accelerator pump for the secondary system. Brass tubes extend from the air horn in to the POE reservoir's in the main body. When the throttle opens up the secondary shaft, and begins to pull air, the suction pulls open the secondary air valves on the air horn, which lifts the secondary rods to allow fuel flow to the secondary system. The POE gives a shot of fuel to the secondary when the flow begins, and helps a quick smooth transition to the secondaries. With the exit holes under the air valves, the response is quicker. And for performance, quicker is better. The POE above the air valve requires the valve to open first before the reaction can occur. Since most have the POE above the air valve, for my performance and race builds, I make some adjustments and modifications to get the same result as under the air valve location. The POE can be relocated by drilling and plugging originals, but much easier to modify the air valves in my opinion.