Lots of Quadrajet info - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jermasaurus · 05-12-2005, 11:31 PM

I just started disassembling the quadrajet that came on my 85. I was hoping to find the reason that it was running so rich that it would foul out a set of plugs in a week. Well, nothing too obvious yet... but I am hoping that if I pay attention to detail that I can succesfully rebuild it and get much better mileage than the 12mpg my holley gets. I have been following a manual I bought, but stumbled on this site a little while ago. It has some pretty good links for quadrajet information- so if anyone is trying to learn about these then you may want to browse around here http://www.florida4x4.com/tech/quadrajet/index.php

badone07 · 05-13-2005, 01:28 AM

While you have it apart, you can also check out here... http://www.73-87.com/7387garage/garage_drivetrain.htm under "Air & Fuel Delivery." Didn't see it in the links page you posted.

bodydropped · 05-13-2005, 10:37 AM

no offense im runnin a 650 holley and im gettin 19 miles to a gallon

jermasaurus · 05-13-2005, 11:38 PM

Quote:

Originally Posted by bodydropped

no offense im runnin a 650 holley and im gettin 19 miles to a gallon

what model? Mine is a 570CFM with vacuum secondaries. I am pretty sure it is tuned correct and I have tried a few different times. I have 64 jets, 6.5 power valve, 1.5 turns out on the idle mixture screws, and the secondary spring that came in it new.

Anyways, I put my Quadrajet back on today and it runs and accelerates extremely smooth. I'm at 3/4 tank now, so I will have a good figure on mileage after my next fill up.

bodydropped · 05-14-2005, 03:16 AM

well mines a 650 not sure the model # when i bought it i put it on and had no problem till i poped the power valve and the jets i was runnin were 73s on a stock 350 know im runin 66s with no problems i drove from beaumont to rosenburg in 3/4 tank which is a 2 or so hr drive i could have drove from beaumont to austin with the q-jet in a tank and a 1/4 byut i hated it when it flooded so i bought a holley

jermasaurus · 05-14-2005, 08:23 AM

The reason that I bought the Holley was also because the quadrajet flooding. I mean, the plugs reaked of gas and I had to change them about every week. My 15 gallon tank got me 92 miles! Hopefully my Quadrajet isn't gonna flood out and act all wierd with me anymore, or else that Holley is going right back on.

05-12-2005, 11:31 PM	#1
jermasaurus Registered User Join Date: Dec 2004 Location: New Lenox, IL Posts: 442	Lots of Quadrajet info I just started disassembling the quadrajet that came on my 85. I was hoping to find the reason that it was running so rich that it would foul out a set of plugs in a week. Well, nothing too obvious yet... but I am hoping that if I pay attention to detail that I can succesfully rebuild it and get much better mileage than the 12mpg my holley gets. I have been following a manual I bought, but stumbled on this site a little while ago. It has some pretty good links for quadrajet information- so if anyone is trying to learn about these then you may want to browse around here http://www.florida4x4.com/tech/quadrajet/index.php

05-13-2005, 01:28 AM	#2
badone07 Project 2 Resume Join Date: May 2004 Location: Jim Thorpe, PA Posts: 884	While you have it apart, you can also check out here... http://www.73-87.com/7387garage/garage_drivetrain.htm under "Air & Fuel Delivery." Didn't see it in the links page you posted. __________________ John 1984 C30 Chevy Crew Cab Dually 1998 Jeep Cherokee 4x4 2004 Chevy Trailblazer 4x4 (wife's) 1970 Mustang FB fully tubed (getting 521 BBF & powerglide) 1978 Nova 2dr (going BBCaddy & S.P. th400) 1984 Monte SS (circle track car)

05-13-2005, 10:37 AM	#3
bodydropped Registered User Join Date: Jan 2005 Location: beaumont,tx Posts: 757	no offense im runnin a 650 holley and im gettin 19 miles to a gallon __________________ http://img.photobucket.com/albums/v5...ropped/sig.jpg

05-14-2005, 03:16 AM	#5
bodydropped Registered User Join Date: Jan 2005 Location: beaumont,tx Posts: 757	well mines a 650 not sure the model # when i bought it i put it on and had no problem till i poped the power valve and the jets i was runnin were 73s on a stock 350 know im runin 66s with no problems i drove from beaumont to rosenburg in 3/4 tank which is a 2 or so hr drive i could have drove from beaumont to austin with the q-jet in a tank and a 1/4 byut i hated it when it flooded so i bought a holley __________________ http://img.photobucket.com/albums/v5...ropped/sig.jpg

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05-14-2005, 08:23 AM	#6
jermasaurus Registered User Join Date: Dec 2004 Location: New Lenox, IL Posts: 442	The reason that I bought the Holley was also because the quadrajet flooding. I mean, the plugs reaked of gas and I had to change them about every week. My 15 gallon tank got me 92 miles! Hopefully my Quadrajet isn't gonna flood out and act all wierd with me anymore, or else that Holley is going right back on.



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