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Unread 09-14-2015, 10:32 PM   #1
baconboy89
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HEI distributor upgrade

I am wanting to do the hei upgrade but i have read a lot about problems with hardened gears. I have a 74 cj5 with the 258 btw. anyone have any additional insight on this problem? this is the distributor I was considering. http://www.ebay.com/itm/AMC-JEEP-CJ5...097110&vxp=mtr It specifically sas it has a hardened gear. Ive also read that the hardened gear is fine for the 258 because the cam gear is part of the cam. An insight about the hardened gear is greatly appreiciated. Also if this is not a good distributor other reccomendations would be great too. I do have a points type distributor now though so some conversions will not work. Im sure you all know that though

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Unread 09-14-2015, 10:43 PM   #2
Mortgage-payer
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The concerns about gear hardness were relevant 5 or 6 years ago. From what I've seen you they seem to have their act together.

Can you take the gear off your existing distributor and install it on the new one? Best of all worlds.
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Unread 09-14-2015, 10:52 PM   #3
Bgeddes
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unless the cam has been replaced, the hardened gear might pose a problem

Either reuse yours or get one from a jeep specific source. The HEI can come from any Chevy straight 6.


The HEI is a really nice upgrade for your 4.2
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Unread 09-14-2015, 10:53 PM   #4
baconboy89
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I have not ordered the distributor yet so i don't know if the gears will swap over. The description of the distributor specifically calls it a hardened gear but it also says itit's oe spec so should I not worry?
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Unread 09-14-2015, 10:58 PM   #5
baconboy89
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I do not think the cam has been replaced. Do you know of a source that I could get a high quality gear from?
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Unread 09-15-2015, 09:25 AM   #6
JeepHammer
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Depending on budget, for about $300 you can get a DUI,
Davis Unified Ignition,
And they normally don't kill engines.
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Unread 09-15-2015, 10:57 AM   #7
hunterstroble
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2nd that. I have a DUI distributor. You get what you pay for.
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Unread 09-15-2015, 11:20 AM   #8
swatson454
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Quote:
Originally Posted by hunterstroble View Post
2nd that. I have a DUI distributor. You get what you pay for.
And their customer service is some of the best I've ever seen.
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Unread 09-15-2015, 06:24 PM   #9
AeroMoto73
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I've got one that I took off after I upgraded to TBI and computer controlled ignition. Only had it on for a year. Too bad it's for a V8 or I'd make you a nice deal.
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Unread 09-15-2015, 07:03 PM   #10
CSP
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Your '74 has a Delco points distributor (if stock still) and the gear will swap over to an HEI.
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Unread 09-15-2015, 08:19 PM   #11
Ken4444
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Quote:
Originally Posted by JeepHammer View Post
Depending on budget, for about $300 you can get a DUI,
Davis Unified Ignition,
And they normally don't kill engines.
I took the plunge and put a DUI HEI with a quality set of spark plug wires on my 258 and it made a noticeable improvement, especially getting on the freeway when accelerating from 40 to 60 MPH. I have said this so many times here that I'm sure some people are tired of reading it. Then, drop on the Weber 38 and my 258 was *really* lively at all speeds. These are two upgrades well worth the time and money.
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Unread 09-17-2015, 11:38 PM   #12
baconboy89
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Quote:
Originally Posted by CSP View Post
Your '74 has a Delco points distributor (if stock still) and the gear will swap over to an HEI.
So I could get a GM hei and the gear would just swap over? if i did that would i need to adjust the advance curve? That seems quite complicated.
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Unread 09-18-2015, 09:08 AM   #13
CSP
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Yes you could since you have the straight six engine. That's exactly what's in mine. You do not have to adjust the timing curve. It wouldn't hurt, but it's far from necessary.

Any '75-80 GM HEI from a straight six is the distributor you want. IIRC, the '75 has a remotely mounted coil and the rest of the years have it in the cap.
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Unread 09-19-2015, 07:00 AM   #14
CurtG
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Quote:
Originally Posted by Ken4444 View Post
I took the plunge and put a DUI HEI with a quality set of spark plug wires on my 258 and it made a noticeable improvement, especially getting on the freeway when accelerating from 40 to 60 MPH. I have said this so many times here that I'm sure some people are tired of reading it. Then, drop on the Weber 38 and my 258 was *really* lively at all speeds. These are two upgrades well worth the time and money.
Weber 38 and a DUI here also...great pair!
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Unread 09-19-2015, 12:41 PM   #15
baconboy89
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I'm lookimg at one on ebay, the guy says he buys them for the gm I6 with no gear and then puts the AMC gear on them. (Its the same guy that sells the Motorcraft carbs for jeeps)
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