Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Please help with carb recipe - 455 GTO

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lrust:
Hi Cliff,

Just bought your book and went through my carb.  Carb info and car setup is below.

Carb number: 17057504  (0357 AYO)

Idle screw hole:  .094 - idle screws were not bottoming out
secondary hangar - K
secondary rods: DA
primary jet: 75
primary rods - tapered:  .025, .040 and .062
fuel seat: .135
idle tube: .0595
idle down channel: .0465
lower idle air bleed: .0785
upper idle air bleed in air horn: .0935
upper idle air bleeds main casting: .0465
accelerator pump discharge holes: .073
main air bleed (main body): .115
main air bleed (air horn): .115
secondary brass tube restriction: .043
holes in throttle plates: .11

Carb has APT
Carb does appear to have idle bypass

I bought it second hand and used it for a year.  It was refurbed by Jet Products as a "stage 3" unit.
My car is 67 GTO, 3800 lbs, with 455 and 670 heads (stock), cast intake with headers, TH400 and ATI 10 inch converter with 3.55s.  Car would not idle below ~ 1000 RPMs with MVA (I know you are not a fan of MVA) and a bunch of initial timing.  Car pulls hard at WOT.  I was not able to get AFR meter working reliably so I can't comment on mixture.

Heads are currently out for porting and should flow ~ 260 ish.

When reading your book I thought I should go with recipe 3 until I found that I had a "large main air bleed" carb, like on page 112.

Need recipe recommendations.....

Thanks in advance for the response as well as the help you have provided on the PY forums.

Lowell

lrust:
forgot to mention:  SD OF cam with 1.5 rockers.

Cliff Ruggles:
If your numbers are correct it is a MESS!

I can't believe it could have been used for a year with any level of success, it needs a LOT of changes to get it where it needs to be for that application.

Did you at least put one of our kits in it?  I would have also made recommendations and sent tuning parts to get it straightened out......Cliff

lrust:
Gulp....I was afraid you were going to say that.

Please give me your recommendations on parts to buy and kits from you and I will start working on it (part numbers if easily available).  I would send to you but I understand how busy you are.

Carb is still apart - it is clean and in good shape - just needs proper tuning. 

Thanks,
Lowell

Cliff Ruggles:
Lowell, when you get time call the shop and we can go over a few things and get you on the right path to getting the carb up to par for what you are doing.

We're available 8am-4pm, M-F EST, and most Saturdays 8am-noon......Cliff

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