Page 2 of 2 FirstFirst 12
Results 11 to 14 of 14

Thread: holly ultra hp feedback

  1. #11
    Senior Member RACING JUNKIE
    Join Date
    Dec 2007
    Location
    ohio
    Posts
    812
    thank's for the replys guys, jmark i am leaning toward the 7320 for 461, was worried about any lean conditions with the two circuit metering, i see they have fairly small hsab, does this indicate they may have a starvation problem up top?

  2. #12
    Senior Member RACING JUNKIE jmarksdragster's Avatar
    Join Date
    Jul 2007
    Location
    Florida
    Posts
    635
    I have a 1250 converted to a 2 circuit and no issues. An to the contrary, the factory Holley 3 circuit Dominators (not the Ultra with billet blocks) can run lean up top, they have idle feed tubes in the mainwells that can be restrictive in some cases. The 2 circuit blocks do not have the tube nor the issues that they can create. The smaller airbleeds are there to get the metering flat without the 3rd circuit. Also, the 3 circuit Dominators tend to be excessively rich in the midrange where the intermediate becomes active. This can create issues with loading up in the burnout. For bracket racing you want the carb on the lean side driving around at part throttle to keep the plugs clean, yet be tunable to what the engine needs at full throttle. The 7320 would work fine for what you want to do.
    Mark Whitener
    http://racingfuelsystems.myfunforum.org
    __________

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

  3. #13
    Senior Member RACING JUNKIE
    Join Date
    Dec 2007
    Location
    ohio
    Posts
    812
    thank's for the info jmark.

  4. #14
    Senior Member RACING JUNKIE
    Join Date
    Dec 2007
    Location
    ohio
    Posts
    812
    jmark if you are out, got a ? about the 7320, it came with 95.s for jet front and back, both having power valve,s, i am thinking this would make the thing super fat, i want to block off the power valves, here's my hang, with the cfm, and this being a 2 circuit, would i hurt myself by pluging the power valves. in other words, go too lean, for this design.


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 MH Sub I, LLC dba Internet Brands 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