Holley Carb Tuning on a Mild-ish 289 - Page 5 - Ford Mustang Forum
Like Tree1Likes
Reply
 
LinkBack Thread Tools
PONY Member
 
zray's Avatar
 
Joined: Apr 2006
Location: On the road n NE Oklahoma
Posts: 654
 
Quote:
Originally Posted by paul289 View Post
Alright, got the car back on the road with a new mechanical flat tappet cam since I destroyed the roller cam by spinning several lifters. So, back to cab tuning.

Main thing I could use help with is flooding under braking. No, it's not coming out the float vent. I've got a vent whistle in both front and back. It's coming out the boosters. I can tell because when I have the carb removed, and I tilt it forward, I can see fuel dribbling out of the booster. Really, that shouldn't be happening. Is there some anti-siphon passage that's blocked or does the rear float level need to be lower than the arrow on the sight glass or something?
Every 4150 based Holley will run much better on the street with BOTH floats lowered 4 flats below the sight glass or level plug setting. You will not starve the engine by doing this....

The exception being if you are going to keep the throttle wide open in top gear for longer than 30 seconds. In that case you need jet extensions and higher floats. But for 99.99% of us, lower the floats. That will solve many many drivability issues with the Holley dual float carbs.

Z

paul289 likes this.


Galaxie 500
'65 K code Mustang
& a few '66 GT350's (1970-2012)
zray is offline  
Sponsored Links
Advertisement
 
post #62 of 62 (permalink) Old 06-04-2018 Thread Starter
GT Member
Classic Member
5.0L Member
 
paul289's Avatar
 
Joined: Feb 2008
Location: Everett
Posts: 1,530
 
Just seems like a patch fix, but I guess changing the jetting to compensate will do the trick. I did lower the rear bowl 3 or 4 flats below the center of the sight glass, and that did help a lot. Would it also help surging while creeping near idle in first if I did the same in the front bowl?


Proud owner of a '65 289 coupe. Equipped with Edelbrock Performer intake, Quick Fuel 680HR carb, ported stock heads, 282 Magnum solid cam, Hedman longtube headers, MSD ignition, and decked and ported heads. T5 transmission with hydraulic clutch. Griggs Racing GR350 suspension. 8.8 rear end. Griggs front & Wilwood rear brakes. Many more mods to come!
paul289 is offline  
Sponsored Links
Advertisement
 
Reply

Tags
carburetor , holley , quick fuel , tuning

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a VALID email address for yourself, otherwise you will not receive the necessary confirmation email needed to confirm, validate and activate your new AFM member account.

Failure to provide a VALID email address, will result in the cancellation of your new AFM member account registration.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome
 


Search Engine Friendly URLs by vBSEO 3.6.1