Welcome to Club Hot Rod!  The premier site for everything to do with Hot Rod, Customs, Low Riders, Rat Rods, and more. 

  •  » Members from all over the US and the world!
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and hundreds of thousands of posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

 

Thread: What size carbs for blown 454?
          
   
   

Reply To Thread
Results 1 to 7 of 7
  1. 01-03-2006 08:06 PM #1
    70_"SuperNOVA"'s Avatar
    70_"SuperNOVA"
    70_"SuperNOVA" is offline CHR Member
    Visit my Photo Gallery
    Join Date
    Jun 2005
    Location
    El Paso
    Car Year, Make, Model: 1970 Chevy Nova
    Posts
    56

    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!
    Reply With Quote Reply With Quote
  3. 01-03-2006 08:19 PM #2
    pat mccarthy's Avatar
    pat mccarthy
    pat mccarthy is offline CHR Member/Contributor
    Visit my Photo Gallery
    Join Date
    Apr 2005
    Location
    bay city
    Posts
    10,546

    i have used 750 edelbrocks i like them
    Reply With Quote Reply With Quote
  4. 01-03-2006 08:47 PM #3
    techinspector1's Avatar
    techinspector1
    techinspector1 is offline CHR Member
    Visit my Photo Gallery
    Join Date
    May 2003
    Location
    Zephyrhills, Florida, USA
    Car Year, Make, Model: '32 Henway
    Posts
    12,423

    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.
    PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.
    Reply With Quote Reply With Quote
  5. 01-04-2006 07:59 AM #4
    erik erikson's Avatar
    erik erikson
    erik erikson is offline CHR Member
    Visit my Photo Gallery
    Join Date
    Aug 2004
    Location
    clive
    Car Year, Make, Model: BLOWN 540 57 CHEVY
    Posts
    2,878

    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.
    Reply With Quote Reply With Quote
  6. 01-04-2006 08:54 AM #5
    dizzle
    dizzle is offline CHR Member
    Visit my Photo Gallery
    Join Date
    Aug 2005
    Location
    n/a
    Posts
    27

    i've got edelbrock 750's on mine, its similar to your motor and they work fine right outta the box.
    Reply With Quote Reply With Quote
  7. 01-04-2006 09:09 AM #6
    pat mccarthy's Avatar
    pat mccarthy
    pat mccarthy is offline CHR Member/Contributor
    Visit my Photo Gallery
    Join Date
    Apr 2005
    Location
    bay city
    Posts
    10,546

    Thumbs up

     



    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
    Reply With Quote Reply With Quote
  8. 01-04-2006 10:04 AM #7
    70_"SuperNOVA"'s Avatar
    70_"SuperNOVA"
    70_"SuperNOVA" is offline CHR Member
    Visit my Photo Gallery
    Join Date
    Jun 2005
    Location
    El Paso
    Car Year, Make, Model: 1970 Chevy Nova
    Posts
    56

    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!
    Reply With Quote Reply With Quote
Reply To Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Forum Rules

Links monetized by VigLink