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How do you figure Carb size?

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Old Jul 14, 2011 | 11:37 PM
  #1  
NathanLewis's Avatar
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From: Virginia
Car: 85 camaro z28
Engine: 355
Transmission: t-5
Axle/Gears: 3.73
How do you figure Carb size?

I switched my goals of a 383 cranking 400 hp, to a more budget friendly and realistic goal of 300 hp 355sbc. How do you figure how many CFM the carburetor should be? The camshaft plays a role into it doesn't it?
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Old Jul 15, 2011 | 12:36 AM
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1gary's Avatar
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Re: How do you figure Carb size?

Use the carb cfm calculator in this link:

http://www.csgnetwork.com/automotiveconverters.html
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Old Jul 15, 2011 | 01:11 AM
  #3  
Apeiron's Avatar
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: How do you figure Carb size?

For 300 HP something in the 600/650 CFM range would be fine.
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Old Jul 15, 2011 | 08:42 AM
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Re: How do you figure Carb size?

Originally Posted by Apeiron
For 300 HP something in the 600/650 CFM range would be fine.
X2.Cam selection depending if a vacuum secondary or not.
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Old Jul 15, 2011 | 10:40 AM
  #5  
UnderCover89TBI's Avatar
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From: Manteca,California. Nor Cal.
Car: SOLD IT. Mopar guy only now.
Engine: gone
Transmission: gone
Axle/Gears: gone
Re: How do you figure Carb size?

355x2=710 so IMO as long as you dont go over that you'd be fine. (i think a 650 would be plenty sufficient) its better to be a little too small then too large
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