Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

350 pontiac

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cris85:
hello, i'm french!
my English is not very good!
i have two firebird!
a 1968 firebird convertible 400/th400 and a 1978 firebird with a 1970 350 pontiac engine!
i need help finding the right calibration of my carb , it's for the 1970 350 pontiac engine.
i have edelbrock intake, an aac k2801
(Intake Duration at 050 inch Lift,
214 Exhaust Duration at 050 inch,Lift 224
 Duration at 050 inch Lift   214 int./224 exh.
Advertised Intake Duration      272
Advertised Exhaust Duration      282
Advertised Duration      272 int./282 exh.)
dual exhaust, cr 9.5, power brake, th350

i have a 1968 rochester quadrajet 7028264.
i want a street application!
can you help me? ( idle tube, idle down channel  restriction, ...)
regards
chris

Cliff Ruggles:
Chris, do you have one of our books?

Without typing many pages here, it is well explained in our book......Cliff

cris85:
yes, off course, i have your book!
but i want your opinion.
i make it:
idle tube:0.37
idle down channel:0.55
upper idle: 0.50 ( air horn)
down idle: 0.70
idle bypass:0.80
mixture screw: 0.96
primary met.:i buy it on your sit
sec met.: i buy it
main jet: 0,73

i try it, but i'm not sure, because the car start very well, i can adjust idle very well but after, she make a bad reaction: when i accelerate gently, i have hole! i think she takes too much gas !!!
i want to install back the original primary and secondary met. and jet?
thanks

65WildCat:
[when i accelerate gently, i have hole!]

Make sure you secondary air flap spring tension is not set too loose...

cris85:
i'm sure the secondary air flap spring tension is not set too loose!
the problem is not when I accelerate hard, but when I accelerate just a little!
I try to post a video

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