GM HEI conversion

[Jackpot50]

Thought I would give this conversion a try because I will be convertion to a fuel injection setup later. I took my 440 to the Dyno to start and adjust everything before I got it into the car. Bought a mopar electronic distributer, GM electronic 4 pin module, blaster ss coil, made a mounting plate, wired & mounted it. Tried to start motor no spark, swapped wires coming out of distributer. Got spark but very hard to start. Has 12 volts to coil all wires are tight, after it starts runs great 469 Hp @ 6000 -528 fpt at 3500 but starts like crap timing set at 26 degrees advanced to get it started.
Put on a new module same results started hard ran good, next took off module and put on A MSD 6AL box started right up did run had to retard timing back to 12 degrees advanced did another pull 5800rpm 465 hp @ 5500 -528 fpt at 3500.

What is up with the module it is a 79 GM
This is got me scratchin my head.

 

[Jonnyuma]

Did you check the voltage drop during startup? Mopar starters use a lot of juice and the factory wiring sucks. I put an HEI in my 76 Chrysler and am having similar results. It started right up a couple of times then...nothing. Lots of GOOD grounding and lots of voltage is what these things want (need) to run. I'm considering a relay to separate the starting and ignition circuits. A lower draw starter would help too, I think. There's a lot of information out there about converting to the HEI module, I can't find anyone whose done the distributor and coil too, 'cept me.

 

[Meep-Meep]

I worked on a 69 GTX a while back that had an HEI module zip tied to the vac advance can. Pretty hokey installation but it ran fine. Looks like they used the factory Chrysler mag pick up too and just spliced it into the HEI.

There is an aftermarket distributor that is built on this principle -
http://www.hotrodsusa.com/store/images/ignitionplus/IGN9036714.jpg

I also found this -
http://redneckfabrication.com/image...formance_Ignition/GM_HEI_CONVERSION_MOPAR.jpg

 

[Jackpot50]

Found out had pickup wires backwards, when they are turned it advances 17 degrees and that is exactly what we had on dyno.

 

[A383Wing]

Found out had pickup wires backwards, when they are turned it advances 17 degrees and that is exactly what we had on dyno.

yup...I had that issue as well on a customers car.

here is a link also for mounting a module to our distributors

http://www.designed2drive.com/