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This is a 2 part question for similar projects, that I've seen a lot of discussion of in these forums.

1) My 351C-4V (in a '31 Ford Coupe) currently has a Mallory dual-point with Mallory ProMaster 28720 coil.  Nothing currently wrong with the dual point; but I think the engine would benefit with the hotter spark and reliability issues.  The coil says (it spoke to me directly...) it can be used with points or with electronic ignitions, specifically mentioning the Duraspark.  The installation of the Mallory coil specifically stated to use their resistor, IN ADDITION TO, the stock Ford resistor.  This is in contrast to what I've read about the DS1 coil.  What would your recommendations be ??

2) I also want to convert my "other" car, a 64 Comet with 289/C4 to a Duraspark.  Similar situation: will use DS1 control module, 77 302 dist, and I have another Mallory Promaster #29440, which is strictly for electronic ignitions.  And again, the question of usability in this setup (vs. a DS1 coil) and the resistor/resistance question.  But in this case, it's a built in resistance wire from the ignition switch.

    The Mallory is new:  bought on sale at Mallory 30 some years ago......, and being retired, cost IS a consideration.   But will it work ??   And do I use the Mallory specified resistor ??         George ??              Thanks.

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Last edited by mikemccarthy
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I don’t think you’ll find a 100% solution or instructions on this, because you are "sort of" in uncharted territory. 

All I would say is you can try it.

You shouldn't really be risking anything by having too much resistance in the power feed for the coil.

In my experience when I had the ballast resistor in my system using the Ford TFI coil, the problem was not that it didn’t operate - it ran fine at lower RPMs, but I had problems with the engine was at higher RPMs.  I believe the lower voltage to the coil didn't let it charge fully at higher RPMs. The engine would miss.

I took out the ballast resistor, and it has run great.

 Give it a try...  tell us what you find. Work on one car at a time.

 

Last edited by rocky

You're mixing & matching parts here, so as Rocky said, try it. If the thing you are asking about is a square solid state e-coil and NOT a cylindrical can-of-oil coil, in my limited experience it works fine with a full 12v and acts as a rev limiter @ 4500 rpms w/around 9v. You won't damage anything- it just may not work well.

Well, I solved the Comet problem.  Looks like I can sell the Mallory coil on Ebay and make enough to buy the matching distributor and coil, and a new set of wires.   The wire to the coil is getting a full 12V, so that should work.   I see new and remanned dizzys for about the same price.  I'm actually leaning toward the reman to get (hopefully) an original Motorcraft/Autolite casing.  I've read about "issues" with a lot of the new Chinese stuff.

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