Results 1 to 2 of 2

Thread: 390 CFM Holley alcohol carb?

  1. #1
    Senior Member DYNO OPERATOR
    Join Date
    Jan 2004
    Location
    central Illinois
    Posts
    459

    390 CFM Holley alcohol carb?

    A stock car guy brought me a Holley 4150 double pumper to rebuild. Said it ran great down the straightaway but blubbered bad in the turns. He is running Torco gasoline, he says. He thinks it is a 750 CFM carb. The choke horn has been removed , so no Holley number on it.

    I noticed it looked a little strange when he left it off. It is. It is 1 1/8" venturis and 1 7/16" throttle bore. That makes it a 390 CFM I think. But when I took it apart it has stainless needle and seats, 90 jet size, .059" squirters and 35 power valves front and back. (It also had the back float shut completely off with the needle and seat run all the way down.) I think this has to be an alcohol carb.

    Anyone have any input on this?

    Someone went to a little trouble to make a small alcohol carb? Why?

    I thought 309 carbs were pretty rare anyway?

  2. #2
    Senior Member RACING JUNKIE jmarksdragster's Avatar
    Join Date
    Jul 2007
    Location
    Florida
    Posts
    635
    No wonder it ran bad on gas.... :shock: Sounds like time for a new carb for him. Not sure who would run a 390 alky carb off hand. He probably had to close the back N&S to make the fuel close on gas for WOT, but would still be rich on part throttle. He will be MUCH happier when he gets a gas carb on it.
    Mark Whitener
    http://racingfuelsystems.myfunforum.org
    __________

    Good work isn't cheap, and cheap work can't be good.


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Copyright © 2005-2016 RacingJunk.com All Rights Reserved.

Designated trademarks and brands are the property of their respective owners. Use of this Web site constitutes acceptance of the RacingJunk.com
Terms of Use, Classifieds Disclaimer, Privacy Policy, and Cookie Policy