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Old 07-10-2003, 10:10 PM
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Carburetor?

I have a big block 402/ 4bbl engine and just found out i needed a new Carburetor because my edelbrock 1405 600 cfm Carburetor was not powerful enough... now if that's true, which carburetor should I purchase? i'm in too speed so I would like a performance one with a matching intake manifold.

thanks in advance
joey

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Old 07-10-2003, 10:25 PM
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you need a 750 cfm Holley.
i don't care what anyone says, that is the ultimate all purpose carb. everybody should have one. i mean afterall, we all want speed right?
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Old 07-10-2003, 10:59 PM
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Quote:
Originally posted by crazy larry
you need a 750 cfm Holley.
i don't care what anyone says, that is the ultimate all purpose carb. everybody should have one. i mean afterall, we all want speed right?
Thank God you said it Larry, amen to that...the worlds only universal carb. I love-em.
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Old 07-27-2003, 04:17 PM
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Interesting...

Hope you don't mind if I jump into this thread with a carburetor question of my own.

I think I'm going to have to replace the carburetor on my '67 Buick Riviera (430 engine). I just had the Rochester Quadrajet rebuilt, after having much work done to the engine. Unfortunately, it seems that this carb is beyond repair. I'm having the engine hooked up to a Sun machine tomorrow to determine for sure that the carb is causing the issues.

Most Buick guys have suggested I keep the Quadrajet and rebuild it. I think it's been messed with in the past and it's time for a new one though. I'm now trying to decide on a brand and model. I've heard good things about both Edelbrock and Holley, but I'd like to make the best possible decision. I'm looking to keep/increase my hp, but also have decent my fuel milage as this is my daily driver.

I also want a carb that I know will fit without altering my 430's factory settings (i.e. no adapters or the like). Edelbrock does have a Quadrajet they say should be identical to factory specs...but I'm open to suggestions.

Thanks,
Dan
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Old 07-27-2003, 04:37 PM
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I will add a little something to this...........

If you have to ask which carburetor you need.........then you need the Edelbrock. You most likely do NOT have the experience and know-how to get the most out of a Holley.

At WOT .......a propery tuned Holley will, as a general rule, make more HP than the Edelbrock. I run Edelbrocks on all my Chevrolets. I like them. I can make them run. They are just a AFB in a Edelbrock box. I have had Holley and they are good. I ran two Dominator 1150's on my drag race BBC.

But for the street I prefer Edelbrock.........no leaks, easy to adjust and have a good parts supply.


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Old 07-29-2003, 01:18 AM
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Dan, if that's the original Qjet, get it rebuilt by a competent carb shop. That carb was calibrated for your engine, & if rebuilt (not replaced) it will work better than anything else. The old Qjets from those days had some inherent problems with leakage, but those problems have long since been solved. Some shops don't redo the primary throttle shaft bores, & will tell you it can't be fixed. I had mine fixed with bushings & rebuilt, & it works as well now as it did when it was new. I had used a new replacement from Rochester, but it didn't work nearly as well as the old one does now. Glad I kept it. Any carb you get new will (unless you're very lucky) need to be recalibrated by someone who really knows what they're doing. If yours is OEM, GM has already done that for you.
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Old 07-29-2003, 08:58 AM
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Thanks Jim,

Hopefully my QJet isn't beyond repair. The guy who rebuilt it came highly recommended. Anyway, we checked the primary throttle shaft bores, and they had no play, so he didn't re-bush them with brass. Maybe that's an issue, even though they're nice and tight.

I dropped off the car last night at a shop with a Sun diagnostic machine. I'm hoping this guy can find something we couldn't when we tested with a vacuum gage, timing gun, spraying carb cleaner for vacuum leaks, etc.

I'll keep you posted on the outcome.

Dan
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Old 07-30-2003, 02:30 AM
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