General Category > Quadrajet Carb Talk and Tips

70-74 Cadillac Qjets

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Cliff Ruggles:
They would allow a bigger gulp of air than a solid flap the instant the throttle plates opened.  Not sure about how quickly they would employ vs solid ones.  They are pretty rare right to start with, showing up once in a while on a Marine Q-jet.

I never spent any time testing them and use and prefer solid flaps over any other type......Cliff

mcx:
Cliff, thanks again.....I'll swap the flaps out  with a cheap eBay parts core.

Cliff Ruggles:
As noted in my book solid flaps are preferred with a hole under the flaps. 

Second best is a large hole directly in line with solid flaps as used on the 1975-79 Pontiac 350/400 carburetors.

Third is making a very small "notch" directly in line with holes just above the flaps.  An alternative to a notch is to allow just a tiny bit of slack in the linkage so the flaps "tip" back every so slightly with the pull-off fully applied so the fuel can go into the engine the instant the huge secondary throttle plates open.

The worst set-up is solid flaps with holes located high above them.......Cliff

mcx:
Thx Cliff...I think this Caddy is the worst set up..5th place LOL

I disassembled the 1973  Buick 800cfm and was matching it up to this 1973 Cadillac....the base plate is similar enough to the Cadillac...they both have matching lower gaskets(3 holes on one side and 5 on the other)..the passages take slightly different routes but seem to go to the correct place....the key thing here being I can get the Cad base plate with APT back in the game on the Buick, which is great..
..I was measuring the height adjustment by turning the APT screw and it seems to give 4/32" rise and fall...is that enough to function correctly?

Cliff Ruggles:
I would NOT change the baseplate as it's never a good idea to start mixing/matching parts.  There are small differences between different baseplates even if the bolt in place and look pretty much the same at a glance......Cliff

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