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Thread: What size carbs for blown 454?
          
   
   

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  1. 01-03-2006 08:06 PM #1
    70_"SuperNOVA"'s Avatar
    70_"SuperNOVA"
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    What size carbs for blown 454?

     



    I am currently building a 454 chevy big block with a forged crank, h beam rods, forged pistons, roller rockers, hydraulic roller cam with about 5.70 lift, 8.0:1 flatop compression, large oval port heads w/ 2.19 valves, 8-71 weiand blower running about 8lbs of boost. This will be in a 70 chevy nova. It will be used for street and some strip use. Any suggestions on what size carbs to use? Also, is there a formula for carb sizing with forced induction? Thanks!!
    !Supernova!
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  2. 01-03-2006 08:19 PM #2
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    i have used 750 edelbrocks i like them
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  3. 01-03-2006 08:47 PM #3
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    Blown CFM=(CID x RPM) / 3456 x (BOOST / 14.7) +1

    454 x 6,000 / 3456 =788.19

    8 / 14.7 = 0.544 +1 = 1.544

    788.19 x 1.544 = 1,216.96 CFM


    454 @ 7,000, 8 lbs = 1,419.80 CFM
    454 @ 8,000, 8 lbs = 1,621.20 CFM

    Last edited by techinspector1; 01-03-2006 at 08:51 PM.
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  4. 01-04-2006 07:59 AM #4
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    Re: What size carbs for blown 454?

     



    Originally posted by 70_"SuperNOVA"
    I am currently building a 454 chevy big block with a forged crank, h beam rods, forged pistons, roller rockers, hydraulic roller cam with about 5.70 lift, 8.0:1 flatop compression, large oval port heads w/ 2.19 valves, 8-71 weiand blower running about 8lbs of boost. This will be in a 70 chevy nova. It will be used for street and some strip use. Any suggestions on what size carbs to use? Also, is there a formula for carb sizing with forced induction? Thanks!!
    I would try two 650 Demon carbs for blown applications.
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  5. 01-04-2006 08:54 AM #5
    dizzle
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    i've got edelbrock 750's on mine, its similar to your motor and they work fine right outta the box.
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  6. 01-04-2006 09:09 AM #6
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    Originally posted by dizzle
    i've got edelbrock 750's on mine, its similar to your motor and they work fine right outta the box.
    yes did two 454 likes this right out of the box
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  7. 01-04-2006 10:04 AM #7
    70_"SuperNOVA"'s Avatar
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    750's sound like the winning application then! I kinda like the 750 demon blower carbs. Any experience with demon carbs? being that they lean more toward racing? This engine will get plenty of street time too! Thanks
    !Supernova!
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