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Old 03-25-2005, 12:42 PM
FASTCAMARO
 
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Which Carb? Help!!!!!

I am not sure which carb to order for my engine. I want a holley street avenger. I am not sure, 770 cfm or 670cfm? I have a zz430 crate engine. 350 with gm fast burn heads, 520 lift cam, duration at 50 is I218 & E228, air gap manifold, th350 trans with 220 stall converter,373 gears, in a 68 camaro. horsepower should be 430. Any help would be greatly appreciated!

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Old 03-25-2005, 01:05 PM
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Which Carb?

Is this a regularly street driven vehicle?
If its going to be street driven, I would go with the 670, in a vacuum secondary, particularly in light of your running an automatic.
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Old 03-25-2005, 01:26 PM
Technical Support Barry Grant
 
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Which size carburetor?

Joe,

With the tight converter, and low rear gear ratio a 650 Vacuum Secondary carburetor will give you your best overall performance.
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Old 03-25-2005, 02:56 PM
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Barry Grant makes a carb. special for this crate engine, which is a 750cfm. After seeing this, I seem to be leaning towards the 770 holley! Please, correct me if I'm wrong!
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Old 03-26-2005, 02:09 PM
Technical Support Barry Grant
 
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Joe,

With the tight converter, and low gear ratio you are using a 650 is going to be a better choice on your combination. A 750 may cause poor drivability.
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Old 03-26-2005, 07:17 PM
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Tech is right..Id even consider 625. the ZZ430 makes its power within 6000 RPMs. no need for more carb than that.
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Old 03-26-2005, 07:55 PM
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Quote:
Originally Posted by Tech @ BG
Joe,

With the tight converter, and low gear ratio you are using a 650 is going to be a better choice on your combination. A 750 may cause poor drivability.
/\these guys either design them or know those who do, I'd take their advice. There is an "approxomate" carb size formula assuming 100% volumetric efficency:
(engine cubic inches)x (max rpm)/ 3456= approx ideal carb size

according to the formula, you'd be better with the smaller carb.
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Old 03-31-2005, 09:09 PM
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size does matter

Dittos on the carb formula, finally, another adherant to it.
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