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Mod | | | Forums66 Topics128,086 Posts1,056,101 Members48,434 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Apr 2006 Posts: 38 Apprentice | | Apprentice Joined: Apr 2006 Posts: 38 | I recently obtained a 67 C20. It runs and drives but it hesitates and dies, if I slam the trottle down. I was thinking of just getting a new carb and intake. Any thoughts? Brands/Models? Rebuild?
Nick | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | V-8 or 6 cyl.? Most of the time it's best to o-haul the original carb.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Jan 2005 Posts: 364 Shop Shark | | Shop Shark Joined: Jan 2005 Posts: 364 | I had more carb. related headaches with a small block (327) that I had once, that I finally bit the bullet and bought a brand new Edelbrock 600cfm electric choke carb and never looked back. Right out of the box I had to do very minimal adjustment, and plan on putting Edelbrocks on my future projects. I've used an Edelbrock carb on a quadrajet manifold with a spread/square bore adapter, and also on a Edelbrock Performer manifold with 1" spacer, both work great.
Keith
If it were easy they'd have grade schoolers doing it!
| | | | | Joined: Aug 2007 Posts: 36 New Guy | | New Guy Joined: Aug 2007 Posts: 36 | I have a 350 in my '50 suburban with a quadrajet on it. It is a tempermental carb and will soon be replaced with an Edelbrock 600cfm. My car club buddy has one on his '48 1/2 ton with 350 that he put on new out of the box 4 years ago and has done nothing to it but drive. Mine idles fast, slow, dies at stop lights, exit ramps etc. And that's all in one 500 mile trip. Plus, can't seem to find the right bracket for a Gennie Shifter linkage.
Probably buy and install the new carb next weekend.
Robert | | | | | Joined: Mar 2006 Posts: 1,703 Shop Shark | | Shop Shark Joined: Mar 2006 Posts: 1,703 | I ALSO WHOLEHEARTILY AGREE.... I messed with the Holley 650 that was on my 350 for a month spent bunches an $ and ended up tossing it and purchasing the Edelbrock 600 electric choke,model "4106" bolted it on and after 5 minutes of tuning I havent touched it since!
My truck rolls over bought a half a revolution and is running ....I love it.
Tim | | | | | Joined: Nov 2002 Posts: 2,766 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,766 | With all respect to those who have posted that have had success with the clones:
Comparing something new to something needing work will normally mean the something new works better.
However, comparing a clone on a SBC to a properly functioning Q-Jet would result in:
(A) fuel economy of about 10~15 percent less for the clone
(B) low RPM torque of maybe 5~10 percent less for the clone
(C) more difficult hot starts for the clone
(D) no improvement in high end HP for the clone
Remember that the Q-Jet is a 750 CFM carburetor (150P/variable 600S). The 600 clone is 250P/variable 375S (no, this is NOT a misprint!).
Running the clone through a square-bore -> spreadbore adapter (not changing the intake) reduces the clone to a 525 CFM (150P/variable 375S).
However, the clone is convenient, if you don't object to the loss in performance.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | | | | Joined: Aug 2004 Posts: 1,067 Shop Shark | | Shop Shark Joined: Aug 2004 Posts: 1,067 | Holley's are not hard to tune once you understand how they work. In fact, I've always thought they were the easiest to tune.
52 GMC 3/4 ton pickup
68 Big Block Vette
68 455 Firebird
| | | | | Joined: Feb 2006 Posts: 1,867 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 1,867 | For a V8, I like the Rochestor Q-jets.
They are a great carb, but highly misunderstood. Thanks to the advice here I picked up the Q-jet book and it blows my mind how well it works now. It took about three times of pulling it apart and trying it out before I was finally satisfied with how it ran. The book made a world of difference.
That and ALWAYS replace the old phenolic float! They saturate with fuel over time and give an inappropriate float level due to the extra weight.
Good luck, Jeff | | |
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