Manifold Vaccum line - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 04-29-2004, 10:23 PM
Member
 
Join Date: May 2003
Location: Gresham, Oregon
Posts: 39
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Manifold Vaccum line

I have a mild chevy 350 and it has a 450 rochester quadrajet right now. I have a Dual plane, Performer intake manifold and I want to slap a 600 holley, double pumper carb on it but the vaccum on the manifold for the transmission is in the way. Is there anyway I can make something or buy something so it will clear??? Any help is appreciated. Thanks

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 04-29-2004, 10:40 PM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,658
Wiki Edits: 0

Thanks: 15
Thanked 60 Times in 57 Posts
In some cases you have to use a carb spacer (4 hole perferred) or you can stack gaskets providing you sealant them together with a light coat of sealant, you can also look for a lower vacuum bung off other intakes. also check yours and see if it can be threaded further in. I doubt you`ll see much performance improvement by going to the Holley, if there`s any at all, but you will notice a MPG difference, and it won`t be for the better.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 04-29-2004, 10:43 PM
Member
 
Join Date: Aug 2003
Location: California
Posts: 903
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
1980Impala,

The easiest way to do this is to remove the fitting in the rear of the manifold and install an allen pipe plug. It will sit flush with the manifold and not get in the way of the Holly.
To get vacuum to the transmission use one of the vacuum ports coming off the base of the Holly. When you start the engine find the fitting that has manifold vacuum at idle and no vacuum when you rev-up the engine. You may have to add some hose to the steel line to reach the new port but when you get that hooked up you will be good to go.

Have Fun
Scholman
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 04-30-2004, 05:10 AM
Wrencher's Avatar
Member
 
Last photo:
Join Date: Aug 2003
Location: cincinnati
Age: 56
Posts: 607
Wiki Edits: 0

Thanks: 5
Thanked 0 Times in 0 Posts
450 Q-jet, doesn't exist, the 4G came in 485,550 and690, your carb should be 750 cfm, 1-3/32 primaries!
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last 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.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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 On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 11:18 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.