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Unread 07-07-2011, 07:38 AM   #1
copauls863
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1982 CJ7 
 
Join Date: Mar 2009
Location: Winslow, Arizona
Posts: 121
250 dizzy

Anyone do this whole 250HEI distributor swap? I read somewhere it works, you just need to swap the gears. Anyone know of a good write up on it?

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Unread 07-07-2011, 07:40 AM   #2
JeepHammer
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1973 CJ5 
 
Join Date: Aug 2007
Location: South West Indiana
Posts: 10,059
Nothing to it, just change gears, use a V-8 gear, and plug it in.

The gears are the tricky part, some of the gears on the market a not high quality and sometimes cause problems.
Getting a V-8 gear through the dealership will keep you from getting one of the poor quality import gears.
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Unread 07-08-2011, 07:06 PM   #3
copauls863
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1982 CJ7 
 
Join Date: Mar 2009
Location: Winslow, Arizona
Posts: 121
Like same year jeep 360 gear? is it the exact same gear?

/edit: 304 i mean haha
would the one of of my 258 dis. work on the 250 one?
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Unread 07-08-2011, 07:54 PM   #4
JeepHammer
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Yup, AMC V-8 gear they are all the same.
Takes a 'V-8' gear to fit the shaft, I-6 gears are too small of a center hole.

V-8 gear on the I-6 GM HEI distributor will work, no problems.
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Unread 07-08-2011, 08:00 PM   #5
copauls863
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1982 CJ7 
 
Join Date: Mar 2009
Location: Winslow, Arizona
Posts: 121
cool man other than that i just have a +/- on the module connector right?
assuming that, i would just need to tap the - for the tach signal on my tbi?
and then the negative goes to ground? + i assume i can tap a wire from the old module?
also, ur the man, man
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Unread 07-08-2011, 10:44 PM   #6
JeepHammer
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1973 CJ5 
 
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Location: South West Indiana
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You didn't say a thing about TBI...
Depending on the TBI you are using, you will need a GM HEI 7 pin module, fits right in where the standard 4 pin modules comes out...

Power wire comes through the ignition switch, 'Run' position (NOT the 'Accessory' position) and out to the 'BAT' connector terminal on the side of the distributor cap.

Your tach will depend on what tach you are running.
If it's a factory tach, Ignition switch, through tach, out to distributor.

If it's an aftermarket tach, then you should have instructions, usually a 'Green' wire out to the Negative terminal marked 'Tach' on the cap connector.

One is most aftermarket tachs are voltage signal triggered, meaning it counts the number of times the coil turn 'On' and 'Off',

The factory tach is a CURRENT triggered tach, and it has to run in series in the ignition source line.
Stupid way to do things, but this is AMC after all... Save them 5 cents on the extra wire.
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Unread 07-09-2011, 10:58 AM   #7
copauls863
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1982 CJ7 
 
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Location: Winslow, Arizona
Posts: 121
I dont have a tach but i know the tbi has a wire hooked to the - on the coil, else it wouldnt run.
it is running a gm tbi, through howell. now its just sounding like too much work, the only reason i wanted to do it was to move everything to one unit and eliminate as many wires as possible..
so how would you wire the dis to work with the 7 pin put in it?
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