quadrajet metering rods - The 1947 - Present Chevrolet & GMC Truck Message Board Network

slow69 · 09-19-2003, 10:25 PM

Anyone change these things? I have a brand new carb for an 82 Blazer but it is for a 305 and I just put in a 350. I read in Chevy High Performance that you need to change the metering rods to richen it up for higher displacement. I have an old carb off a 350 and was wondering if I could just switch them out or buy new ones?
Thanks for the help,
Slow69

slow69 · 09-19-2003, 11:49 PM

ttt

Bryan68custom · 09-19-2003, 11:51 PM

If your 350 is stock or close too it , I would try the carb as is , it may work out just fine for your application

ChevLoRay · 09-20-2003, 07:05 AM

If you will, go to edelbrock.com, and check out their technical information. They offer a Q-Jet replacement that I happen to have on my '69. The technical section lets you navigate to get the info you're looking for. It should answer your questions.

tom hand · 09-20-2003, 10:22 AM

GM in their great money saving wisdom used the same jets and metering rods on about 5 million different applications...lol. I would not be surprised if you pulled the two carbs apart they had the same rods/jets. How did they do this? Q-jets are super sensitive to float settings. If you have ever bought a q-jet rebuild kit, there is a whole page in the directions with different float settings for different applications...you may need to just raise the float.

slow69 · 09-20-2003, 11:28 AM

thank you. I am breaking the engine in today and didn't want to run it lean. thanks for your help everyone.

Blazer1970 · 09-21-2003, 08:57 AM

The power valve is operated by engine vaccum, so even the primaries are self-compensating for engine displacement to some extent. There are literally hundreds of different metering rods for the Q-Jet with different tapers and different size tips. Edelbrock lists right in there catalog that the same Q-Jet will work on 305 to 454 cubic inch engines.

09-19-2003, 10:25 PM	#1
slow69 Registered User Join Date: Dec 2000 Location: Flagstaff, AZ Posts: 140	quadrajet metering rods Anyone change these things? I have a brand new carb for an 82 Blazer but it is for a 305 and I just put in a 350. I read in Chevy High Performance that you need to change the metering rods to richen it up for higher displacement. I have an old carb off a 350 and was wondering if I could just switch them out or buy new ones? Thanks for the help, Slow69

09-20-2003, 07:05 AM	#4
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	edelbrock.com If you will, go to edelbrock.com, and check out their technical information. They offer a Q-Jet replacement that I happen to have on my '69. The technical section lets you navigate to get the info you're looking for. It should answer your questions. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

09-20-2003, 10:22 AM	#5
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	GM in their great money saving wisdom used the same jets and metering rods on about 5 million different applications...lol. I would not be surprised if you pulled the two carbs apart they had the same rods/jets. How did they do this? Q-jets are super sensitive to float settings. If you have ever bought a q-jet rebuild kit, there is a whole page in the directions with different float settings for different applications...you may need to just raise the float. __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

09-21-2003, 08:57 AM	#7
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	The power valve is operated by engine vaccum, so even the primaries are self-compensating for engine displacement to some extent. There are literally hundreds of different metering rods for the Q-Jet with different tapers and different size tips. Edelbrock lists right in there catalog that the same Q-Jet will work on 305 to 454 cubic inch engines. __________________ Tim

09-19-2003, 11:49 PM	#2
slow69 Registered User Join Date: Dec 2000 Location: Flagstaff, AZ Posts: 140	ttt

09-19-2003, 11:51 PM	#3
Bryan68custom Registered User Join Date: Aug 2003 Location: Denison, Tx. Posts: 189	If your 350 is stock or close too it , I would try the carb as is , it may work out just fine for your application

09-20-2003, 11:28 AM	#6
slow69 Registered User Join Date: Dec 2000 Location: Flagstaff, AZ Posts: 140	thank you. I am breaking the engine in today and didn't want to run it lean. thanks for your help everyone.



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