Need Rochester carb help!! - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old Jun 23rd, 04, 05:42 PM Thread Starter
 
Join Date: Jun 2004
Posts: 8
Post

I recently bought a '69 396/350 4-spd w/a remanufactured 7040206 IF Rochester. There was no vacuum to the distributor, so I pulled the carb, removed the base (part w/butterflies) and I noticed the dist vacuum port hole came from the tube on the outside and passed down through the thick base gasket and right into a "dead-end" rectangle shaped hole in the base. IT WENT NOWHERE! My base # is 40687. I don't know if the gasket is supposed to connect this hole to an adjacent hole into the venturi or if the base is wrong or what??? I'm guessing the vacuum to advance the distributor should come out above the butterfly, not below. Any ideas or places I can call ? Has anyone seen this before? Help....
cimchazz1 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old Jun 23rd, 04, 05:56 PM
Senior Tech
Brandon
 
Join Date: May 2004
Location: Monroe, NC
Posts: 2,058
Garage
Post

check that there is a multiport fitting behind the carb on the manifold that will supply full vacuume. Power breaks may or may not be hooked up to it.. Your choice it to connect to it, or there may be a vacuume out tube on the front left corner of the carb. Advance should get full vacuume and not ported.

If niether of these exist. go to your local auto store and ask for a manifold vacuume port adapter. You'll likely find it on the performance isle.

Brandon J. licence 1NASTY67

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Nantooch is online now  
post #3 of 6 (permalink) Old Jun 24th, 04, 01:50 PM Thread Starter
 
Join Date: Jun 2004
Posts: 8
Post

Thanks, I'll give it a try. Looks like my "Champion" remanufactured carb has the wrong base. CS
cimchazz1 is offline  
 
post #4 of 6 (permalink) Old Jun 24th, 04, 06:30 PM Thread Starter
 
Join Date: Jun 2004
Posts: 8
Post

WOW, that's more like it. I connected the distributor to a tube sticking out just above the white nylon choke unload diaphram. I have 15 Hg of vacuum now to the distributor. This engine has probably been running retarded for the last 8 years. Now I need to set the initial timing and should probably have the dist put on a Sun machine so I know where I'm at. Any suggestions on initial or what my vacuum gage should read at that port at 800 RPM? Or any other RPM? It's a '69 SS396/350 manual M20 trans stock engine w/3:55 posi rear. Thanks, Chuck S.
cimchazz1 is offline  
post #5 of 6 (permalink) Old Jun 25th, 04, 10:06 PM
Senior Tech
Brandon
 
Join Date: May 2004
Location: Monroe, NC
Posts: 2,058
Garage
Post

I'm not sure that BB and SB have the same timing specs.. But try 6-10* btdc a try when shes warmed up and the vacuume advance disconnected and the port closed off.
Nantooch is online now  
post #6 of 6 (permalink) Old Jun 27th, 04, 05:53 PM Thread Starter
 
Join Date: Jun 2004
Posts: 8
Post

Thanks for the tip, I got it up to 12* and it seems to start right up and run pretty good, but I think I really need to find out what is going on in my distributor.
cimchazz1 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech 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.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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

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