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#1
05-18-2005, 08:26 AM
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This is kind of a dumb question. I am currently running a stock Q-jet on my fairly stock 400. I have access to a 750 Edelbrock. Would the Edelbrock make more power then the Q-jet. Thanks
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#2
05-18-2005, 08:26 AM
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This is kind of a dumb question. I am currently running a stock Q-jet on my fairly stock 400. I have access to a 750 Edelbrock. Would the Edelbrock make more power then the Q-jet. Thanks
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#3
05-18-2005, 08:46 AM
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Your Qjet is a 750 also. Unless it is a later model, then it is an 800. I'd keep the qjet.
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 frittering and wasting the hours in an off hand way.... 1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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#4
05-19-2005, 06:09 PM
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I started out with the performer intake and the Edelbrock performer 750 carb. The carb. ran fine until I got on it. It seemed the secondarys would not open til I got the RPM's up to 3500. Also, when they did open, it was a very smooth transition. Not what I am looking for in a muscle car. I swithced to the Q-Jet 750, and after some minor adjustments it works great. If I get on it the secondarys will open right off the line. You can hear it and you can feel it. Just my opinion, and my experience.
Good luck, Rob |
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#5
05-20-2005, 04:59 AM
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We obtained a nearly new Edelbrock 750 AFB clone here for testing. After pissing with that thing for weeks we determined that they are NOT a good choice for serious high performance work. Very easy to recalibrate, but the lack of adjustment to the secondary airflap is a "showstopper". They must be set up for whimpy SBC engines because our 455 test engine whipped the flap open so quick it would "stumble/hesitate/bog" no matter how we jetted it. Even so, idle quality was good, off idle and cruise very good, and strong full throttle power once you got past the big "dead spot". Aside from adding or removing weight from the secondary airflap I wouldn't know how to fine tune one for any particular application? With the q-jet it's a matter of seconds to adjust the tension spring for the secondary airflap and secondary metering changes can be made about as quickly without taking the carb apart.
I noticed that Edelbrock came out with the "Thunder Series", AVS design units. I'm certain this move was prompted by complaints about their AFB clones.....Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#6
05-20-2005, 05:15 AM
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Yup, I seconfd that. I have a Edel 750 on my 455 w 041 cam. Not impressed acctually. I had this same carb on my SBC in my truck years ago, seemed way more suited to the SBC. I never even did any tuning on it in my truck. On the 455, I have tinkered with it for way to long. It's coming off this morning acctually, been working all week preppin a Q jet
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Dan Pesonen  "If it ain't broke, modify somethin till it is" |
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#7
05-20-2005, 05:22 AM
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Actually edelbrock seems to have brought out the the AVS in defiance of history. Carter had several aftermarket high performance AVS carbs available in the early '70's. No where near the performance of the AFB and Carter couldn't give the things away. Of course, they had the TQ going by then and it did a MUCH better job than either the AVS or even the AFB. The TQ is spread-bore based, like the Q-Jet and available up to 1000 CFM.
Jon. Jon.
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"Good carburetion is fuelish hot air".  "The most expensive carburetor is the wrong one given to you by your neighbor". If you truly believe that "one size fits all" try walking a mile in your spouse's shoes! Owner of The Carburetor Shop, LLC (of Missouri). Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings. |
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#8
05-20-2005, 05:42 AM
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Jon,
The 'revived' AVS that E'brock is now selling as the "Thunder Series" is in fact an AFB lower section with an AVS top. It has secondary venturiis, not discharge tubes like the original AVS. So I guess they picked the best attributes of both carbs & combined into one. I have As far as the original question goes, I have the E'brock 800 CFM AFB & am more than happy with it. Never had a flat spot. I have a 455, Turbo 350 with manual valve body. I can stomp on it at 15mph in 'D' & it just powers ahead. And that is with a 3.08 axle! |
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#9
05-20-2005, 06:10 AM
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The Edel 750's are manual secondaries. There is a metal rod on passenger side that you can bend to make the secondaries come in earlier or later. So you can adjust it. I had the dead spot/ bog too, but by making them come in later it helped a lot. Just my 2 cents.
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