best street carb for my ZZ454 eng. - Chevelle Tech
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post #1 of 4 (permalink) Old Apr 12th, 12, 12:51 AM Thread Starter
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best street carb for my ZZ454 eng.

i'm currently running a 780 holley dual feed on my ZZ454 engine. seems like it could use a bit more carb. any recommendations? thanks john
my car is a 69 chevelle with a 4 speed and 410 gears.
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post #2 of 4 (permalink) Old Apr 12th, 12, 7:40 AM
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Re: best street carb for my ZZ454 eng.

Tell us a bit more about your combo; stock ZZ454cam? intake, etc.

Just from a cfm standpoint, 780 seems like plenty.

Dan
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post #3 of 4 (permalink) Old Apr 12th, 12, 11:07 AM
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Re: best street carb for my ZZ454 eng.

Quote:
Originally Posted by john6066 View Post
i'm currently running a 780 holley dual feed on my ZZ454 engine. seems like it could use a bit more carb. any recommendations? thanks john
my car is a 69 chevelle with a 4 speed and 410 gears.
I would think that a 780 CFM Holley with vacuum secondaries (and a large air cleaner) would be ideal, but the Carb itself might need to be tweaked (jets, springs, etc.) to provide the response and level of service you're looking for. The formula to figure CFM is: CFM = (RPM x CID) / 3456. Which works out to 788.19 ASSUMING a 100% efficiency (sorry, but not likely). Any larger CFM and you'll actually degrade engine performance. Is there a Dyno shop nearby? THAT might be a better investment!

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Last edited by NickeyChevelle; Apr 12th, 12 at 11:23 AM.
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post #4 of 4 (permalink) Old Apr 12th, 12, 11:19 AM
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Re: best street carb for my ZZ454 eng.

Alot of people are running 750's on their 454s... Your carb may need some tuning or rebuilding but definately not more cfm.
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