Subject: Re: GM-HEI Conversion
Date: Thu, 18 Feb 1999
From: zdoc, zdoc@yosemite.net

Hi Rob, Doc here, You need to contact Dr. Jacobs about the specific type of coil that you are currently using to determine whether you need the ballast resistor or not.

The next question that I have to ask is the purpose to eliminate the original factory Trig Box? Did it go bad? Or are you just looking for something else? Don't forget that you must supply a tach signal to the ECU (Electronic Control Unit) so that the injectors will fire.

There is a guy up in Gary's neck of the woods named Kyle Hagemann (http://www.sonic.net/~kyle/ztech.html ..ed.) I believe. He has a wiring diagram for the conversion you are going to do. please remember that you need to use an aluminum plate to mount the module on with dielectric grease so that it will act as a heat sink. It
is a straight foreword job that you should have up and running quickly.

I hope that this helps you.................
ZDOC OUT

RobSime@aol.com wrote:
Z Owners of Northern California - http://www.zonc.org

ZONC'ers,
I am converting my 78 Z coupe's HEI to the GM HEI and I have some wiring questions for any of you who have done this. I am using a Jacobs coil presently and I would like to eliminate the ballast resistor and wire the distributor to the HEI and the HEI to the coil. I am not sure the coil is an internal resistor type but I can check that through Jacobs. Can I wire it this way,or do I have to retain the ballast resistor?

Thanks in advance.
Rob Sime