Too much carb - Impala Tech
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post #1 of 5 (permalink) Old 04-16-2014, 05:56 PM Thread Starter
 
 
Join Date: Dec 2013
Location: Wisconsin
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Too much carb

Is a 600cfm carb too big for a 283 ? But the right size for a 327?
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post #2 of 5 (permalink) Old 04-16-2014, 10:59 PM
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I would think a 390 would be the perfect size for a street driven 283, but no your 600 cfm carburetor is not to big. Keep in mind it is still only a 300 cfm two barrel until the back two barrels open up. That will not happen until the motor is drawing enough manifold vacuum to open the rear barrels.

If you are spinning the motor high enough frequently enough then that carb will be far too small. Chevrolet puts a 780 cfm four barrel on their 430 horsepower 427 yet install an 850 cfm double pumper on top of the race ready DZ application code 302 RPO engine code Z-28 that has mechanical tappets to go along with the mechanical secondary barrels and the engine will routinely spin to 8,700 RPM (it's shift point).

I would think that there are literally thousands of those carbs on top of a 283 or even a 327. I know that it is the most commonly encountered carb size at a flea market. I used to be able to find and buy those carburetors routinely for twenty five dollars used.

Big Dave
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post #3 of 5 (permalink) Old 04-17-2014, 04:21 PM Thread Starter
 
 
Join Date: Dec 2013
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Too Much Carb

That is great news. Right now I have a 283 in the car, but I plan on putting a slightly ( souped ) up 327 in later. I did not want to have to settle between being too big for one motor and right for the other. Or the other way around.
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post #4 of 5 (permalink) Old 04-17-2014, 09:54 PM
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I had a new Edelbrock 600 on a stock 283 for a while, I think you'll be fine at both ends.

HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
http://www.impalas.net/forums/blog.php?u=1432
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post #5 of 5 (permalink) Old 05-15-2014, 11:50 AM
 
 
Join Date: May 2014
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If it's a 600 with vacuum secondaries you will be fine.
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