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#1 |
Registered User
Join Date: Feb 2010
Location: salem oregon
Posts: 225
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carb question on 454
Say, any one using a 600 cfm carb on their 454 BB? if so, your opinion? Too little performence?
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#2 |
Registered User
![]() Join Date: Apr 2010
Location: Hagerstown, MD
Posts: 246
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Re: carb question on 454
I'd just like to say a couple things. First I am running a BB LS6 which really like to be turned..as in RPM. I had a Holley 650 single pumper elec. choke. I swapped it out last month with an Edelbrock 750 1411 and it really woke the motor up.
Truth be told, it depends on the RPM you will be turning. On a 454, if you willbeturning the motor over 5000 rpm, you will need more than 700cfm. If it is used as a work motor, a 600 or 650 is better. For my high reving LS6 (that came stock from the factory on 1970 in the Chevelle SS with a 800cfm carb) I thought the 750 would be a good match. and it seems to be a pretty good improvement and better fuel mileage too.
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John Paap Ole Greenie Hagerstown, MD My Mistress 70 CST Short/Step LS 5.3/4L65E New motor install Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=667773 |
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#3 |
Registered User
Join Date: Feb 2010
Location: salem oregon
Posts: 225
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Re: carb question on 454
yes, it is my daily driver, to work and errands, etc. so, maybe a 600 would be fine.thank you.
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#4 |
Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: carb question on 454
I think a 600 cfm carb will be too small on a big block. Get a vacuum secondary 750, the motor will only use the fuel it needs.
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#5 |
Registered User
Join Date: Feb 2010
Location: Southern California
Posts: 543
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Re: carb question on 454
I had a 650 on my k2500 burb with a 454. It was too small. I put qjet on it.... solved my problems.
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Doug '72 GMC K2500 Suburban 4x4 |
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#6 |
Registered User
Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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Re: carb question on 454
454ci X 5000rpm /3456= 656.829cfm
The 600 may be a tad small for that engine. You could definetly use it for street use. If you plan to install a cam or rev it past 5000rpm, you might want to consider at least a 650 or 750. I recommend either a well-built Q-jet or a 670 Holley Steet Avenger carb.
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#7 | |
Registered User
![]() Join Date: Sep 2001
Location: Fort Wayne, Indiana, USA
Posts: 1,887
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Re: carb question on 454
Quote:
I think the 600 cfm will work VERY well. MOST people over-size carbs on street engines and suffer the consequences. The other quality (and personally recommended) alternative is a Quadrajet. When properly set-up, it really cannot be over-sized. |
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