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270 hemi dual point dist. pertronix conversion
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hondaman1974
Posted 2019-08-13 4:04 PM (#585971)
Subject: 270 hemi dual point dist. pertronix conversion


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Posts: 76
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Location: Northern Illinois
hi, im converting my dual point distributor on my 55 270 hemi to electronic ignition. would anybody know the pertronix part number for this conversion. the dist I have is a autolite iaz-4003f mopar part number 1641956. also switching to 12v. thanks in advance
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56D500boy
Posted 2019-08-13 5:21 PM (#585978 - in reply to #585971)
Subject: RE: 270 hemi dual point dist. pertronix conversion



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Not sure about 55 hemis but I installed a Pertronix 1383 also known as CH 392 in my D500 dual point IBK-4301A distributor.

Yours might be different. Maybe a 1385LS???

http://shop.pertronix.com/media/wysiwyg/PerTronix2019.pdf

It was easy. Just don't break your flexible ground wire just to make it challenging.





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wayfarer
Posted 2019-08-15 1:58 PM (#586054 - in reply to #585971)
Subject: Re: 270 hemi dual point dist. pertronix conversion



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...or, you could just drop in an LA electronic dizzy......

.
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hondaman1974
Posted 2019-08-15 9:10 PM (#586060 - in reply to #585971)
Subject: RE: 270 hemi dual point dist. pertronix conversion


Regular

Posts: 76
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Location: Northern Illinois
thanks for the advice. didn't know about the la distributor. is it a direct bolt on or does modification need to be done? will probably use the original distributor with pertronix upgrade. this is good to know for future projects!!
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Powerflite
Posted 2019-08-15 9:46 PM (#586062 - in reply to #585971)
Subject: Re: 270 hemi dual point dist. pertronix conversion



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Yes, it is a direct bolt in for the 270 motor. You can use it with an HEI module too if you like. I sell a kit to mount it to the bottom of the distributor so you don't have to mount a box in your engine compartment.

http://www.designed2drive.com
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hondaman1974
Posted 2019-08-16 11:36 AM (#586097 - in reply to #585971)
Subject: Re: 270 hemi dual point dist. pertronix conversion


Regular

Posts: 76
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Location: Northern Illinois
Nathan, that's a neat item you sell, if I had a spare la distributor laying around I would go that route. I read your website it said the oil pump gear had to be changed? is there a height change or is the slot different? just wondering.
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Powerflite
Posted 2019-08-16 11:58 AM (#586098 - in reply to #585971)
Subject: Re: 270 hemi dual point dist. pertronix conversion



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The intermediate shaft is changed on the '55 301 Chrysler, 331, 354, 392, 315, 325 motors. These motors have longer distributor shaft lengths so you change the intermediate shaft to make it work with the new distributor. But the 241, 270, 277, 301 Plymouth, 303, 318, 326 motors will accept the new distributor without any changes. I am not as familiar with the DeSoto hemi motors but I would assume the raised block versions had longer distributors and the smaller 276, 291 motors used the same length as the electronic distributors. But I haven't verified it on the DeSotos yet, so I am just guessing.
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wayfarer
Posted 2019-08-21 3:50 PM (#586344 - in reply to #585971)
Subject: Re: 270 hemi dual point dist. pertronix conversion



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All DeSotos use a longer shaft than the 241-260-270.
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Powerflite
Posted 2019-08-21 5:21 PM (#586348 - in reply to #585971)
Subject: Re: 270 hemi dual point dist. pertronix conversion



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Location: So. California
Thanks Wayfarer. It looks like DeSoto all use the same length shaft, according to Hot Heads.

So then, these motors all use the same size shaft & distributor:
Chrysler 301-354; Dodge 315, 325; DeSoto all hemi's

and these motors use the same as the newer LA small block:
Dodge 241, 270; Plymouth 'A' poly: all

And the Chrysler 392 hemi stands alone as the longest.
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56D500boy
Posted 2019-08-21 6:05 PM (#586351 - in reply to #586348)
Subject: Re: 270 hemi dual point dist. pertronix conversion



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Powerflite - 2019-08-21 2:21 PM
So then, these motors all use the same size shaft & distributor:
Chrysler 301-354; Dodge 315, 325; DeSoto all hemi's


Because I was down in the basement anyway, I dug out my spare (NOS) IBK-4301A dual point 315 hemi distributor and measured the shaft, just to provide a comparison data point.

From the bottom of the upper mounting plate to the end of the shaft I measure ~4.25"

Edited by 56D500boy 2019-08-21 6:08 PM




(IBK-4301A_small_Annotated.jpg)



Attachments
----------------
Attachments IBK-4301A_small_Annotated.jpg (190KB - 25 downloads)
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wayfarer
Posted 2019-08-25 2:02 PM (#586548 - in reply to #586348)
Subject: Re: 270 hemi dual point dist. pertronix conversion



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Location: Central Ory-Gun
Powerflite - 2019-08-21 2:21 PM

Thanks Wayfarer. It looks like DeSoto all use the same length shaft, according to Hot Heads.

So then, these motors all use the same size shaft & distributor:
Chrysler 301-354; Dodge 315, 325; DeSoto all hemi's

and these motors use the same as the newer LA small block:
Dodge 241, 270; Plymouth 'A' poly: all

And the Chrysler 392 hemi stands alone as the longest.


And, MaMopar being who se is/was made some minor variations in shaft lengths but not usually an issue.
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