Page 2 of 2 FirstFirst 12
Results 11 to 15 of 15

Thread: 4150 750 double pumper mechanical secondaries, hard start choke doesnt help.

  1. #11

    Default

    Hi Gary. I have the 14 bushing, the come in a set by 10° & 14°. :-)
    I'll give it a try and change the jet. Thanks for the help. Regards, Rob

  2. #12
    Join Date
    Jan 2010
    Location
    Brisbane, Australia
    Posts
    1,360

    Default

    Ah yes, I remember about they make a pair including a 14°, just after I wrote that. That's probably where my suggestion of 14° came from, about halfway between 10° & 18°. I wish you well Rob. Gary
    Regards, Gary

  3. #13

    Default

    Thanks Gary. Regards, Rob

  4. #14

    Default

    Hi. Status: Changed main jet to 70, works really good. 69 was a bit too lean. Changed the power valve from 6.5 to 5. Changed the bushing to 14°. Set the timing to 16-17° seems to be working a lot better now. Have to do more test runs. Regards, Rob

  5. #15
    Join Date
    Jan 2010
    Location
    Brisbane, Australia
    Posts
    1,360

    Default

    Sometimes, a little combination change is all you need. Gary
    Regards, Gary

Page 2 of 2 FirstFirst 12

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
About us
Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Sprint® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Headers, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.
Join us