Rebuilding QJet or replace... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Cal69Chevy · 03-29-2002, 04:59 PM

I've got an original Qjet R-4 that seems to be causing off idle hesitation. Would a rebuild likely fix this and if so how difficult is it to rebuild this carb? I've never rebuilt any carb so keep that in mind. I'm also considering replacing it with a Edelbrock 1406. Any opinions on which route I should take would be much appreciated.

Thanks,

Ken

**70cst** · 03-29-2002, 05:39 PM

I had the same situation...I just purchased a Q Jet 1901 which is a direct replacement for the Rochester. Actually its a new Rochester built by Eldebrock. I was considering the 1901 or Holley Avenger 770 but after reading all the resposes to the carb questions I went with the 1901. Rebuild would be cheaper but I decided on new to match the rest of the new hardware I just put in my 402BB. Look under Carburetor War which is a topic on this issue. Also Classic Heartbeat also has an issue on this topic.
Regards,
Dewayne 70cst

*Fast68Chevy* · 03-29-2002, 05:54 PM

if you do replace the carb then dont trash the carb especially if its older model before the mid 70s. I plan on buying up more to rebuild, i started on two today, I have very good luck rebuilding these Q jets, they are easy to rebuild and operate more efficiently than Holley carbs, edelbrock and Rochester are same design, they use metering rods instead of crappy power valves. rebuld kits come with exploded view of the carb all disassembled, once you have rebuilt a couple then youll alsways know how to, its not hard,.
good luck

------------------
Randy- Lincoln, IL
randy@ccaonline.com
-71/C-10(thx teeitup and crews!)350 4+4/CH465(thx 71Chev, GMCPaul, and CPNE)longfleet bed(thnx meathead95)!still building it-
-'84 Z28 H.O. 305 L69 700R4 GT4 3.73
- 1984 Firebird SE 2.8L T-5 GT4 3.73
-1981 Cutlass Supreme, dunno what im gonna do with it yet...
-79 G20 pass van, 350/th350/10bolt
*Paint is overrated
© RSS Enterprises 2000

lukecp · 03-29-2002, 07:36 PM

I would go ahead and rebuild the Qjet, kits are cheap at around $25. Dont forget to pick up a new float too. If you still have problems with it, i would suggest getting a Edelbrock 1406. The 1901 Qjet may be a better carb, but i could not afford to spend almost $400 on one, so i bought the 1406. I like it alot, it gave me quite a boost in power, and the electric choke kicks a$$.

------------------
Lucas

"Another proud owner of one of the coolest trucks ever built"

drop_shift@hotmail.com

My Daily-Driver: '72 Chevy LWB Custom/10. Rebuilt 350, 300 HP thanks to a few go-fast goodies. Ochre with a white top. Future plans include a frame off restoration, and maybe a blown 383.

Cal69Chevy · 03-29-2002, 07:48 PM

I'm very tempted to just get the Edelbrock 1406. I've heard that it's easy to tune, stays tuned, adds power and increases fuel economy over the Qjet. For $250 that sounds too good to be true...which makes you wonder if it is too good to be true.

chevy2racr · 03-29-2002, 11:03 PM

I got a holley 650 Q-jet replacement carb onmy 454 and I love it, piece of cake and electric choke

Bryce

03-29-2002, 04:59 PM	#1
Cal69Chevy Registered User Join Date: Nov 2001 Location: SoCal Posts: 136	Rebuilding QJet or replace... I've got an original Qjet R-4 that seems to be causing off idle hesitation. Would a rebuild likely fix this and if so how difficult is it to rebuild this carb? I've never rebuilt any carb so keep that in mind. I'm also considering replacing it with a Edelbrock 1406. Any opinions on which route I should take would be much appreciated. Thanks, Ken __________________ '69 Chevy, 4X4-SB 350 TBI-TH350 Trans-205 Transfer Case-Dana 44 Front-14 Bolt Rear-Front Disc Brakes-Factory A/C-P/S Ken's '69 Page

03-29-2002, 05:39 PM	#2
70cst Senior Member Join Date: Feb 2001 Location: New Madison, Ohio Posts: 21,339	I had the same situation...I just purchased a Q Jet 1901 which is a direct replacement for the Rochester. Actually its a new Rochester built by Eldebrock. I was considering the 1901 or Holley Avenger 770 but after reading all the resposes to the carb questions I went with the 1901. Rebuild would be cheaper but I decided on new to match the rest of the new hardware I just put in my 402BB. Look under Carburetor War which is a topic on this issue. Also Classic Heartbeat also has an issue on this topic. Regards, Dewayne 70cst __________________ A husband can be right...or...A husband can be happy. 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder!

03-29-2002, 07:36 PM	#4
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	I would go ahead and rebuild the Qjet, kits are cheap at around $25. Dont forget to pick up a new float too. If you still have problems with it, i would suggest getting a Edelbrock 1406. The 1901 Qjet may be a better carb, but i could not afford to spend almost $400 on one, so i bought the 1406. I like it alot, it gave me quite a boost in power, and the electric choke kicks a$$. ------------------ Lucas "Another proud owner of one of the coolest trucks ever built" drop_shift@hotmail.com My Daily-Driver: '72 Chevy LWB Custom/10. Rebuilt 350, 300 HP thanks to a few go-fast goodies. Ochre with a white top. Future plans include a frame off restoration, and maybe a blown 383. __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

03-29-2002, 07:48 PM	#5
Cal69Chevy Registered User Join Date: Nov 2001 Location: SoCal Posts: 136	I'm very tempted to just get the Edelbrock 1406. I've heard that it's easy to tune, stays tuned, adds power and increases fuel economy over the Qjet. For $250 that sounds too good to be true...which makes you wonder if it is too good to be true. __________________ '69 Chevy, 4X4-SB 350 TBI-TH350 Trans-205 Transfer Case-Dana 44 Front-14 Bolt Rear-Front Disc Brakes-Factory A/C-P/S Ken's '69 Page

03-29-2002, 11:03 PM	#6
chevy2racr So Many Ideas, So Little Money Join Date: Sep 2001 Location: Marshalltown, IA Posts: 1,610	I got a holley 650 Q-jet replacement carb onmy 454 and I love it, piece of cake and electric choke Bryce __________________ 72 Blazer 3/4 ton running gear 4.10s NP205/TH350 350 4in lift half doors 71 C10 with 454 99 S-10 5.1L SBC 700R4 09 Malibu Marshalltown, Iowa

03-29-2002, 05:54 PM	#3
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	if you do replace the carb then dont trash the carb especially if its older model before the mid 70s. I plan on buying up more to rebuild, i started on two today, I have very good luck rebuilding these Q jets, they are easy to rebuild and operate more efficiently than Holley carbs, edelbrock and Rochester are same design, they use metering rods instead of crappy power valves. rebuld kits come with exploded view of the carb all disassembled, once you have rebuilt a couple then youll alsways know how to, its not hard,. good luck ------------------ Randy- Lincoln, IL randy@ccaonline.com -71/C-10(thx teeitup and crews!)350 4+4/CH465(thx 71Chev, GMCPaul, and CPNE)longfleet bed(thnx meathead95)!still building it- -'84 Z28 H.O. 305 L69 700R4 GT4 3.73 - 1984 Firebird SE 2.8L T-5 GT4 3.73 -1981 Cutlass Supreme, dunno what im gonna do with it yet... -79 G20 pass van, 350/th350/10bolt *Paint is overrated © RSS Enterprises 2000



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