General Category > Quadrajet Carb Talk and Tips

Performance improvement

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Big Blue:
Hi Cliff,
There has been nothing done to the engine that I'm aware of. The car has 32,000 miles on it, it's a 76 Eldorado convertible. It needs an exhaust and when we put that on, we're going to take the catalytic converter off.  The carburetor number is 17056230, and matches the car perfectly. The carburetor looks pretty clean I'm going to pressure test the casting plugs on the bottom this morning as I get started they are filled with epoxy but at your suggestion from an earlier conversation that we had on the phone you said that that shouldn't hurt anything in that normally they aren't leaking I bought a rebuild kit from you about two months ago and I'd have to look at it in order to determine what  parts were actually included. I'm going to say that it was for standard rebuild but we also included new choke pull offs. So I'll be getting back to you in the future about probably all doing some modification after I get the car up and running again and I'll pull the carb back off. By then after getting the rebuild on I'll have a little more experience and maybe I won't be as intimidated about doing the modification from your book still looking for any help and suggestions though thanks to everyone.

Cliff Ruggles:
I would rebuild the carburetor and leave everything stock.  I would remove the plug over the APT screw, and thread the casting for a set screw, so you can remove it and fine tune the APT without taking the carb apart.  Nothing else should be needed anyplace....Cliff

Big Blue:
Cliff,
I certainly appreciate your input and knowledge and will follow what you have to say. I had thought about doing the modification because it's there in the book and I thought that it would possibly help to increase the mileage and the performance of the vehicle a little bit but if stock is going to do the job then obviously it's that much  I had thought about doing the modification because it's there in the book and I thought that it would possibly help to increase the mileage and the performance of the vehicle a little bit but if stock is going to do the job then obviously it's that much easier for me and keeps me from getting into something maybe over my head.
 I'll let you know how it's running as soon as I have it back on the road thanks Cliff

Marx3:
Funny thing, and I just took a look at a 17056230 yesterday. It's on my good friend's '76 Eldorado.
The jets are 70 and the rods are 41P.
Even with the APT turned up pretty high, the engine was still feeling a little tame at low rev's.
I installed 71 jets and had to back the APT out about 4 turns to get a good result on tip-in.
I bumped the timing up to 12 in idle ( this gives a total of low 30's at around 3200 rpm ) and installed an adjustable vacum can for the HEI.
The car went from slow, stock and tame to frying tires when launching too hard in 1st gear. Mid-range power has increased quite a bit. It takes a lot less throttle opening to keep the car at 50. My wideband read 14.3-14.5:1 at cruise.
I installed DA secondary rods because the car developed a loud clattering noise that sounds a bit like detonation. Don't think it is though.

69dvc:
Hey Marx3 or anyone suggestions welcome..

I was intrigued by the Caddy 500 setup mentioned above. I've a 69 472, stock w/ Electronic ignition. My stock engine has a different cam, displacement and higher compression ratio than the 500.. 

I have sized up from 70 jets to 72 on my 7029231 OE quadrajet

It runs quite well with advanced timing BUT it knocks / pings badly at WOT at highway speeds. I feel it is running lean and was considering going up to the 74 jet / 45 rods which worked well in that 75 Caddy

Could this cure my pinging?

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