Current Classifieds

parts needed
Date: 02/20/2017 07:58 am
1980 Pinto Wagon

Date: 02/29/2020 07:01 pm
1974 Ford Pinto

Date: 10/16/2017 10:45 am
Mini Mark IV one of 2 delux lg. sunroof models
Date: 06/18/2018 03:47 pm
Chilton's Repair & Tune-up Guide 1971-1979 Pinto and Bobcat

Date: 03/06/2017 01:24 am
Pinto brake booster needed
Date: 05/08/2021 09:00 am
2.0 Mickey Thompson SUPER RARE cam cover and belt guard
Date: 08/27/2018 11:11 am
1972 Runabout 351 Cleveland V8

Date: 11/05/2016 09:03 pm
1974 Wiring diagram free
Date: 10/27/2019 06:56 pm
1979 PINTO PARTS--FREE
Date: 09/13/2022 02:05 pm
TWM Intake
Date: 08/15/2018 08:20 pm
1971-74 Various Pinto Parts
Date: 01/18/2020 03:44 pm

« previous next »
Pages: [1]   Go Down

Author Topic: Holley 390 cfm 4bbl problem?  (Read 2049 times)

0 Members and 1 Guest are viewing this topic.

Offline 72Wagon

  • Pinto Full Member
  • ***
  • Posts: 132
  • FeedBack: +26/-0
  • Gender: Male
  • My First Car (31 years)

    • Total Badges: 7
    Badges: (View All)
    Topic Starter Signature Poll Voter Tenth year Anniversary Apple User Windows User Fifth year Anniversary
Holley 390 cfm 4bbl problem?
« on: June 26, 2012, 04:54:25 PM »
 I am running a Holley 390 cfm carb, and the problem I am having is that the engine intake vacum is pulling fuel from the accelerator pump squirters at higher RPM's. and causing an erratic miss.  The engine has a a stout camshaft which is not helping. If any one can help me cure this problem I would be a very happy Pinto owner.
Logged
1972 Wagon
2.0 (not stock), 4 Speed with Hurst shifter and roll control, Holley 390 4bbl, Spearco intake, MSD Ignition. 8 inch rearend 3.55 gears, custom dash and interior.

Offline 71hotrodpinto

  • Pinto Sr. Member
  • ****
  • Posts: 389
  • FeedBack: +33/-0
  • Gender: Male
  • Will I EVER finish this car?

    • Total Badges: 8
    Badges: (View All)
    Topic Starter Signature Tenth year Anniversary Windows User Photographer Apple User Mobile User Fifth year Anniversary
Re: Holley 390 cfm 4bbl problem?
« Reply #1 on: June 27, 2012, 02:10:43 PM »
At one time i had the same problem on my exact setup. However its been so long i forgot if i ever solved this issue.
 The 2000cc and the 390 carb end up having a very high inlet velocity which cause this problem.
 
Look and see if there is a Ball or a pointed rod underneath the Acc pump nozzle.
You want the pointed rod. Apparently its heavier and less prone to letting fuel by.
 
This is also an idea.
an " Anti Pullover Nozzle ".
 
 
http://www.ebay.com/itm/Holley-121-231-Anti-Pullover-Nozzle-/200722057521
Good luck!
 
 
 
Logged


95' 302,Forged Pistons,Polished rods
B303,1.7 Rockers,beehives
'68 port/polish heads                   
Coated Must II headers
Edelbrock Airgap
Holley570,Msd dist,CraneHI6
Mil

Offline 72Wagon

  • Pinto Full Member
  • ***
  • Posts: 132
  • FeedBack: +26/-0
  • Gender: Male
  • My First Car (31 years)

    • Total Badges: 7
    Badges: (View All)
    Topic Starter Signature Poll Voter Tenth year Anniversary Apple User Windows User Fifth year Anniversary
Re: Holley 390 cfm 4bbl problem?
« Reply #2 on: June 27, 2012, 05:05:35 PM »
Yes I did look and it has the ball with a brass weight on top of the ball, still getting pullover siphoning at higher rpms.  I site on the net said that the anti-siphoning nozzle helps but did not stop the siphoning on his 4cyl holley 2bbl set up.
 I am going to try adding a tiny spring since it will be an easy attempt, and if that does not work I had suggested a steel weight in place of the brass.
Logged
1972 Wagon
2.0 (not stock), 4 Speed with Hurst shifter and roll control, Holley 390 4bbl, Spearco intake, MSD Ignition. 8 inch rearend 3.55 gears, custom dash and interior.
Pages: [1]   Go Up
« previous next »