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Old 05-06-2003, 04:51 AM
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Post carb question

I've got a holley 4160 in my '64 gmc truck, giving fuel to the 350.

awhile ago i asked folks about saving on gas, and a Quadrajet seemed to be the choice to get better economy. now, as i understand it, this is because the primaries are smaller than the Holley's. So they suck less gas, this makes sense.

but my question is - lets say i want to go 35 mph or something, doesnt my truck need a certain amount of air/fuel to make that happen? Mabye the holley gives it to the engine quicker, but wouldn't the Qjet have to give the same thing to the engine? If this is so, why does the Qjet save me money at the pump?

I kinda like the holley, though its a bit cranky sometimes, and I'd rather not spend the $$ on a new edelbrock Qjet if its not going to save in the long run.

but mostly just curious.

thanks!

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Old 05-06-2003, 05:34 AM
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Quadrajets are more efficient on the primary side due to smaller throttle bore size, it gives it outstanding low end drivability and economy. the massive secondary`s are there when full throttle is needed.
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Old 05-06-2003, 06:00 AM
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hey man, if you had the money, get one of them fuel injected ingines, like a 350, with the injector stuff on it, that would be cool in your old truck.

[ May 06, 2003: Message edited by: chevyman17 ]</p>
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Old 05-06-2003, 11:46 AM
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oh man don't give me any ideas....
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Old 05-06-2003, 01:33 PM
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Keep in mind that a Q-jet can be made to perform close to a holly, It takes a lot of work and tricks. The holly out of the box will perform better, Altho it gets a little cranky with age.

And they look awsome.
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Old 05-06-2003, 02:28 PM
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Any carb will get a little cranky with some wear and tear under its belt, you just have to learn how it works...and maintain it. I like the Q-jet, because Im a cheap arse... most people are willing to give them away for nothing cause they got a "great deal" on a "better" carb. You can piece together an awesome Q-jet on a budget, and most of the tricks are pretty simple. My favorite, since its so easy, is to enlarge the holes in the air horn gasket for the accelerator pump passages..the holes in the gasket are always too small.
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Old 05-06-2003, 05:25 PM
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Speaking of a "cranky" carb, what sort of problems have you'all encountered with a Holley? I've been told that, far more often, problems that are initially suspected to be the carburetor turn out to be something else. I've got a Holley 4150, and I'm not sure if its anywhere near where it should be tuned to. Any ideas?
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Old 05-06-2003, 09:04 PM
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well i rebuilt my 4160 about a month ago and it was going great for awhile except the other day it konked out and - i may be wrong but it seemed like the (needle?) was sticking.

But for the most part I think the carb's been great - I've never had a "performance" car before - my last was a K-Car (which i liked) - and wow its fun to just put the pedal down.
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