changing a 4 pin distribture to a 7 pin - 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 01-18-2004, 05:48 PM
Registered User
 
Join Date: Apr 2003
Location: va
Posts: 5
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
changing a 4 pin distribture to a 7 pin

I would like to put a Holley 950 commander on a 1975 corvette. I have a 4 pin HEI distributer. This system says it needs a 7 pin distributer do you know of any ways to converts the 4 pin to a 7 pin or how to work around this problem so i can use the EFI carb. on my car? Thanks geno

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 01-18-2004, 06:40 PM
M&M CUSTOM's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Transmission identification
Last journal entry: 1988 Suburban, the project continues.
Last photo:
Join Date: Mar 2003
Location: Northwest Pennsylvania.
Age: 43
Posts: 2,231
Wiki Edits: 9

Thanks: 0
Thanked 1 Time in 1 Post
I have always gone the other way 7-pin to 4-pin, but from what i can remember everything will fit in either internally, BUT for the 7-pin to fit I think I remember there will have to be another notch cut into the side of the distributor housing for the conversion.
The internals will interchange but the extra wire harness bulkhead connector slides down into a slot that you will have to cut into the side.

In this picture, the large notch in the distributor laying with the top to the upper left side is the one that needs to be cut in.

In the lower right side view of the top of the distributor the same notch is located at about the 2: O-clock position.

Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 01-18-2004, 11:00 PM
Gino Fultano's Avatar
New Member
 
Join Date: Aug 2003
Location: new jersey
Age: 32
Posts: 20
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
geno, i think you spelled your name wrong
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 01-19-2004, 01:03 PM
Registered User
 
Join Date: Apr 2003
Location: va
Posts: 5
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
what about the extra parts?

the three extra pins that are not what are they going to be used for? thanks alot.
Also do you think this cammander 950 will work good on a 383 supercharged with a whipple charger? Thanks for the advice. Geno (WITH AN E)
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 01-19-2004, 04:52 PM
M&M CUSTOM's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Transmission identification
Last journal entry: 1988 Suburban, the project continues.
Last photo:
Join Date: Mar 2003
Location: Northwest Pennsylvania.
Age: 43
Posts: 2,231
Wiki Edits: 9

Thanks: 0
Thanked 1 Time in 1 Post
The extra pins and the wiring for them are for the CCC or computer command control system, or later known as the ECM, or computer for all us regular folk.
They allow the computer to see where the engine is operating in its RPM range, and to make minor adjustments according to what the computer is designed to do.
I don't forsee a problem as long as you can make adjustments to the ECM for the added displacement, and added power the chip will see and not like.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 01-19-2004, 05:31 PM
Registered User
 
Join Date: Apr 2003
Location: va
Posts: 5
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
ECM

SO, when I hook up my laptop computer to the Holley commaner 950, My laptop acts as the ECM and that is when the extra 3 pins are used. Thanks
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 07:41 AM.


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.