Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Dual quads
Cliff Ruggles:
Locate a stock intake for one of the later engines that had a spread bore design. They are superior to the square flange earlier versions.
The P-Parts catalogs even recommended them as part of a "package" for those engines.
What ET and MPH are you running with the 383 set-up now?.....Cliff
chance:
I'm running 12.8 at 106 mph at 1700 feet above sea level on 26" tall tire. thinking of going to 27.5 tire?
Cliff Ruggles:
ET and MPH are good for the combination.
I ran mostly 1/8th mile with mine when I raced it, as we had a track about 10 miles from the house. It typically ran around 8.0 to 8.2 in the 1/8th mile depending on weather and track conditions.
The big 440 was much quicker, running 7.7 to 7.8 for most outings.
I didn't know nearly as much back then as I do now. My Ventura in full street trim with less gear runs low 7's at 95-96mph. So far best 1/8th mile ET has been 7.18 at just under 97mph. Most outings it runs 7.2-7.3 around 95-96mph. It could really use more gear and converter, but I like the 3.42 gears for the street and the converter is a very tight 10" unit that acts pretty much like a stock converter for "normal" driving........Cliff
chance:
What's in the ventura? 400,455, destroked 301. I only mention the last one because a guy at our local track has one and that thing is nuts it turns over 8000 rpm. I'm building a 400 for my 77 TA. That leads my to my next question. the q jet I've been trying to make work on the charger before I got your book is a 7045333 XM. I haven't had a lot of luck with cracking that number, probably not going to the right web site. This carb is clean and kitted ( not one of your kits ) and very low miles. Anyway I also have another 77 TA carb 17057274 ARN I know these are a good carb to build but this one looks like it rolled around in the trunk for 25 years, nothing is broken mind you the vent is bent over and closed off and the plug for the mixture control broken but all the hard parts are not broken like the base plate or the air horn. My question is. Is it worth it to go through the TA carb or just do some of the mods to the other one like notching the secondary air doors ect.
Thanks!
Chance
Cliff Ruggles:
Not familiar with a 7045333?
I use a 17057274 on my engine. To date it has outran, dyno and at the track every carb we've tested against it, Demon, Holley, Edelbrock AFB and AVS. They are excellent carburetors and plenty for what you are doing. Mine is completely "stock" as far as the castings, never touched with a grinder or sanding roll. It is recalibrated with a few simple tuning mods from my book.
My current engine is a 428 with a 4.21 stroke crank for 455cid. It is topped with KRE heads and 236/245/112 HR cam.
Makes over 550hp/600tq, smooth idle, and strong/broad/flat power curve.
On 1/4 mile tracks I retard the timing 4 degrees, short shift at 5000rpm's, and add 200lbs weight to stay roll bar legal:
https://www.youtube.com/watch?v=6zVdoLR-VzM
......Cliff
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