What kind of carburetor does a Chevy 454 have?
4 rows · Apr 10, 2020 · A 600-cfm carburetor may perform quite well on a stock 350 Chevy. However, the minute you start ...
What size carb do I Need?
Nov 07, 2006 · 454 X 6500 = 2951000 2951000 / 3456 = 854 854 X .85 = 726 726 X 1.3 = 943 I suggest a 950 carb. If the carb is too big, you'll likely have problems with idle quality. If it's too small, you'll have more than one inch of vacuum at maximum RPM with the throttle WFO. Some folks won't tolerate even one inch of vacuum, so carb sizes get huge in a hurry. Are you sure …
Which Q-jet carb for a 454 motor?
Dec 12, 2005 · pdq67. BANNED. Jul 26, 2001. 10,496. Columbia, MO, USA. A stock 454 carb. will do nicely b/c it is a 750 Q-Jet! Get into the motor manuals that MAY be at your Public Library in the automotive section like Motor, Chiltons, Mitchell and hunt up what you need..
How do I calculate the recommended carburetor CFM?
Mar 18, 2005 · Most 'universal performance' 600-650 carbs are calibrated for small blocks. Some are, some aren't. Anyway, 750cfm is fine for stock to mild 454 big blocks. They can work real well for mild to wild 454 big blocks but a step up in CFM will pay off with more power. Generically speaking - 454 up to 350hp can use a 650-750
Is a 600 cfm carb big enough for a 454?
Re: how much cfm carb for 454?? If it's stock or slightly above, a 600 will work fine.Apr 10, 2013
What CFM does a 454 need?
Air flow required is c.i.d. x rpm / 3456. Or 454 x 5000 rpm = 2270000/3456 = 656.83. So at 5000 rpm, your 454 only needs 656 cfm at 100% volumetric efficiency.Mar 28, 2006
How much horsepower can a 650 CFM carburetor support?
Consider using your Google-Fu to find out how much power a 650 cfm carb can produce. If possible, you can expect to get answers of 450-470 HP, but it's not the right fit. Even if horsepower were king, there wouldn't even be any issues with torque in any vehicle.Feb 18, 2022
How do I know what size carburetor to get?
To arrive at the most appropriate carburetor choice, there's a basic formula: engine displacement multiplied by maximum rpm divided by 3,456. For example: a typical 355ci small-block—a 0.030-over rebuild—with a 6,000-rpm max engine speed would work well with a 616-cfm carb ((355 x 6,000) 3,456 = 616.32).Jan 29, 2016
Is 750 CFM too much for a 454?
Because the 454 is less efficient, it doesn't need as much cfm, so a 750cfm carb would be fine while a 650 cfm carb would be too small.Mar 24, 2020
How much HP can 750 CFM carb support?
As an example, a 750-cfm carb on one of my street/strip Chevy 383 small-blocks can make more than 600 streetable hp, whereas an engine less well spec'd may only make 540 to 550.
Which is better Edelbrock or Holley?
As I mentioned before, right out of the box an Edelbrock will be better. However, if you're a DIY guy who likes modding things around – Holley will be your best pal. The tuning is more responsive and less touchy than not only Edelbrock, but most other manufacturer's carbs.
Do carb spacers add horsepower?
On the 350, best results were found with a 2-inch spacer. Its use produced up to 6 more horsepower at peak and as much as 14 more at 750 rpm over peak power. On the 400-inch engine, a stack of three 1-inch spacers produced the best results.Jan 1, 2006
How much horsepower will a 850 cfm carb support?
What Size Engine Use A 850 Cfm Carb?Carb SizeManifold VacHorsepowerHolley 6501.8470.4Holley 7501.5477.15Holley 8500.5474.3Holley 9500.4471.5Feb 8, 2022
Can a carburetor be too big?
According to all of the carb charts you are too big for a street engine. The race 289 used a 715 cfm Holley. You would need a lot of rpms to really need a 750. Throttle response and smoothness of acceleration are some of the problems with too big a carb.Dec 17, 2005
Does a bigger carburetor mean more power?
How Does A Bigger Carb Give More Horsepower? A bigger carburetor has a bigger space that can help to increase horsepower by allowing more air and fuel to travel into the combustion chamber at once. More air and fuel in the combustion chamber means bigger combustion is generated. Thus, more horsepower.Apr 25, 2021
How do I know if my carburetor is too small?
If the carburetor is too small, it restricts airflow into the engine. The cylinder can't fill up all the way. This starves the engine and results in slow acceleration and a lack of top-end power. A larger displacement engine running at higher rpm will require more air and fuel.Apr 13, 2017
puffy Veteran Member
with 60 over, mild cam? I have 600 from the original 454 that was on a truck but I don't think thats enough, is it?
pdq67 BANNED
A great old 3310-, 750/780 Holley will do you nicely for a STREET motor UNTIL you start making some BIG power!! Then step up to an 830 or whatever it is!!
73454 Guest
Another vote for the Q-jet. That's all I run anymore. Got one on all three of my vehicles.
theflash Veteran Member Lifetime Gold Member
I think you need to figure out how you're going to get the BBC in your car before you worry about what kind of carb you need.
